Olympiad Test Level 1: Nouns/Pronouns/Verbs/Adverbs - Class 8 MCQ

The word, 'crew' means 'a group of people who work on and operate a ship, aircraft, etc'. Hence the phrase, 'the crew' given in option B is the correct collective noun which can substitute the underlined phrase. 
The word, 'gang' is a collective noun which refers to a group of slaves, labourers and thieves. The word, 'squad' is a collective noun which refers to a group of soldiers, players and aeroplanes. The word, 'corps' is a collective noun which refers to a group of soldiers in the army, working under a common direction. It also refers to a group of giraffes.
Given the above meanings, the words in options A, C and D cannot replace the underlined phrase. Hence, these options are incorrect.

People in general means public

Abstract Noun denotes an idea, quality, or state rather than a concrete object, e.g., truth, danger, happiness.

Collective Noun is a count noun that denotes a group of individuals (e.g., assembly, family, crew).

Common Noun is a noun denoting a class of objects or a concept as opposed to a particular individual. Often contrasted with proper noun.

Reflexive pronouns are words ending in '-self' or -'selves' that are used when the subject and the object of a sentence are the same. All the given words are 'reflexive pronouns'.
The subject of the given sentence is 'We'. It is a plural pronoun in the first person. The word which fills the blank is the object of the sentence and has to refer to the word 'we'.
Options A and D are incorrect as 'himself' and 'herself' refer to the pronouns, 'he' and 'she', which are in the third person and singular in form. 
Option C is incorrect as 'themselves' refer to the pronoun 'they', which is in third person and plural in form. 
The word, 'ourselves' refers to the word, 'we'. As this word refers to the same word, as the subject 'we', it is the most appropriate reflexive pronoun.

The pronoun who, in English, is an interrogative pronoun and a relative pronoun, used primarily to refer to persons. Unmarked, who is the pronoun's subjective form; its inflected forms are the objective whom and the possessive whose.

Since there are two subjects, the subject is plural, and you should use 'were'.

Use is with singular subjects and are with plural subjects. Collective nouns usually take is, but you can use are if you need to emphasize the individuals who belong to the group.

Here noun is singular, we use 'is'.