_____________ (you / lock) the door before you left the house? 
Correct answer is 'Did you lock'. Can you explain this answer?

Debolina Sen answered
The sentence is an interrogative sentence as we can see there is a question mark at the end. the verb left shows that the question is about something u have supposedly done in the past. let's take an example :
_ (you/eat) apples and drink milk?
answer: do you eat apples and drink milk?
Zainab Ahmed asked a question

Typewriters are the epitome of a technology that has been comprehensively rendered obsolete by the digital age. The ink comes off the ribbon, they weigh a ton, and second thoughts are a disaster. But they are also personal, portable and, above all, private. Type a document and lock it away and more or less the only way anyone else can get it is if you give it to them. That is why the Russians have decided to go back to typewriters in some government offices, and why in the US, some departments have never abandoned them. Yet it is not just their resistance to algorithms and secret surveillance that keeps typewriter production lines - well one, at least - in business (the last British one closed a year ago). Nor is it only the nostalgic appeal of the metal body and the stout well-defined keys that make them popular on eBay. A typewriter demands something particular: attentiveness. By the time the paper is loaded, the ribbon tightened, the carriage returned, the spacing and the margins set, there's a big premium on hitting the right key. That means sorting out ideas, pulling together a kind of order and organising details before actually striking off. There can be no thinking on screen with a typewriter. Nor are there any easy distractions. No online shopping. No urgent emails. No Twitter. No need even for electricity - perfect for writing in a remote hideaway. The thinking process is accompanied by the encouraging clack of keys, and the ratchet of the carriage return. Ping!
Which one of the following best describes what the passage is trying to do?
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Nazil Pasha Pasha asked a question

Read the situation below and answer the questions:
The Computer valley, selling computer hardware, is the only one of its kind in the remote village of Darbhanga. Because online purchases take two weeks or more to arrive, The Computer valley is a quick stop for buying items such as pen drives and USB cables. Besides selling computer hardware, The Computer valley also undertakes repairs of out-of-warranty products.
The Computer valley revenues for the last 3 years has decreased to 4 % from 12% in earlier years. As the e- commerce is growing small shops is struggling to increase profitability.  The Computer valley has been offering a discount on MRP to compete with e-commerce prices.
Q. Which of the following is the BEST reason for The Computer valley NOT to reduce the current discount offered to the customers?
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Zainab Ahmed asked a question

Read the situation below and answer the question:
When Priyanka opened the package, she was perplexed. She received cotton sofa covers instead of satin sofa covers, she had ordered. Priyanka ordered them for her father’s new house from a popular e-commerce website “Slipmart” that hosted products of many sellers.
Confused, Priyanka contacted the seller's office using the details given on the package. The seller's representative profusely regretted and promised to send the satin sofa covers at no extra cost. He added that Priyanka need not return the cotton covers she received. Priyanka happily accepted the deal.
A few days later, Priyanka received another package from the seller. Unfortunately, this package also contained cotton sofa covers. Completely disillusioned with the seller's professionalism, Priyanka decided to put to use these cotton sofa covers also.
Q. Priyanka gave least star out of the maximum 5 stars to the seller and described her experience as pathetic. When the RM called and pleaded with her to change her feedback and upgrade them to 5-star, as they had already terminated the employee contract. He appealed that they were a young organization and that their sales were getting badly affected. Given the circumstances, what should be the IDEAL response?
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Sai Kiran asked a question

Directions for Questions: The passage given below is followed by a set of four questions. Choose the most appropriate answer to each question.

The development underlines the great danger we face from the extension of anti-terrorist measures and methods into normal life – the policing of our streets, for example, and the hounding of football fans and climate change protestors.
Just as disturbing is the line of questioning by the police of those who made freedom of information requests before the alleged hacking of computers last year. In a letter to the Financial Times, Sebastian Nokes, a climate change sceptic and businessman, said he was interviewed by an officer who “wanted to know what computer I used, my internet service provider, and also to which political parties I have belonged, what I feel about climate change and what my qualifications in climate science are. He questioned me at length about my political and scientific opinions”.
The police have a duty to investigate the alleged crime, but this kind of questioning smacks of something far more sinister because a person’s political and scientific views are being weighed to assess his likely criminality in the eyes of the police officer.
Now you might ask how else the police are going to establish who is a suspect. After all, you would certainly ask people about their views if you investigating a string of racist attacks. But this is not a violent crime or a terrorist matter: moreover, Nokes had simply sent “an FOI request to the university’s climate unit asking whether scientists had received training in the disclosure rules and asking for copies of any emails in which they suggested ducking their obligations to disclose data”.
On that basis the police felt entitled to examine Nokes on his views. These days it’s surprising that they haven’t found a way to seize his computer and mobile phone, which is what routinely happens to those involved in climate change protests. Limits need to be set in the policing and investigation of people’s legitimate beliefs. Any future government must take a grip on the tendency of the police to watch, search, categorise and retain the personal details of those who express the political, religious or scientific beliefs. We should never forget that under this government the police have used forward intelligence teams to photograph people emerging from a climate change meeting in a cafe in Brighton; have used the ANPR system to track the movement of vehicles belonging to people travelling to demonstrations; have prevented press photographers from carrying out their lawful right to cover news events; and have combed the computers and searched the premises of an MP legitimately engaged in the business of opposition and holding the government to account.
What this adds up to is a failure of understanding in the police force that one of its primary duties is to protect the various and sometimes inconvenient manifestations of a democracy, not to suppress them. That is why they have to be ultra-careful deploying specialist terrorist intelligence units and treating people’s opinions as evidence.
Q. Which one of these best expresses the author ’s attitude towards Sebastian Nokes?
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Ankit Singh asked a question

Despite their fierce reputation, Vikings may not have always been the plunderers and pillagers popular culture imagines them to be. In fact, they got their start trading in northern European markets, researchers suggest.
Combs carved from animal antlers, as well as comb manufacturing waste and raw antler material has turned up at three archaeological sites in Denmark, including a medieval marketplace in the city of Ribe. A team of researchers from Denmark and the U.K. hoped to identify the species of animal to which the antlers once belonged by analysing collagen proteins in the samples and comparing them across the animal kingdom,
Laura Geggel reports for Live Science. Somewhat surprisingly, molecular analysis of the artifacts revealed that some combs and other material had been carved from reindeer antlers.... Given that reindeer (Rangifer tarandus) don't live in Denmark, the researchers posit that it arrived on Viking ships from Norway. Antler craftsmanship, in the form of decorative combs, was part of Viking culture. Such combs served as symbols of good health, Geggel writes. The fact that the animals shed their antlers also made them easy to collect from the large herds that inhabited Norway.
Since the artifacts were found in marketplace areas at each site it's more likely that the Norsemen came to trade rather than pillage. Most of the artifacts also date to the 780s, but some are as old as 725. That predates the beginning of Viking raids on Great Britain by about 70 years. [Traditionally, the so-called "Viking Age" began with these raids in 793 and ended with the Norman conquest of Great Britain in 1066.) Archaeologists had suspected that the Vikings had experience with long maritime voyages [that] might have preceded their raiding days. Beyond Norway, these combs would have been a popular industry in Scandinavia as well. It's possible that the antler combs represent a larger trade network, where the Norsemen supplied raw material to craftsmen in Denmark and elsewhere.
The primary purpose of the passage is:
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