Introduction
The Durva Book for Class 6 CBSE Hindi is a widely used textbook that helps students learn the Hindi language. It contains various exercises and questions to assess the students' understanding of the topics covered in the book. However, it is important to note that the official answer keys or solutions for these exercises are not readily available.

Explanation
1. Exercise Completion:
- The Durva Book for Class 6 CBSE Hindi includes exercise completion questions where students need to fill in the missing words or complete sentences. These exercises are designed to test the students' comprehension and vocabulary skills.
- Since there are no official answer keys provided by the publishers or CBSE, it is recommended that students check their answers with the help of their teachers or classmates.

2. Grammar Exercises:
- The book also includes grammar exercises that cover various aspects of Hindi grammar such as tenses, gender, singular-plural, etc.
- To check the correctness of their answers, students can refer to their textbook for grammar rules and explanations. They can also seek guidance from their teachers or refer to other Hindi grammar resources available online or in the library.

3. Reading Comprehension:
- The Durva Book for Class 6 CBSE Hindi contains reading comprehension passages that test the students' reading skills and understanding of the text.
- Students can improve their comprehension by reading the passage carefully, understanding the context, and answering the questions based on their understanding.
- While there may not be specific answer keys available for these exercises, students can discuss their answers with their peers or teachers to validate their responses.

4. Writing Exercises:
- The book includes writing exercises where students are required to write short paragraphs or essays on given topics.
- These exercises aim to enhance students' writing skills and their ability to express themselves in Hindi.
- Students can compare their answers with the sample answers provided in the book or seek feedback from their teachers to improve their writing skills.

Conclusion
While there may not be official answer keys or solutions available for the exercises in the Durva Book for Class 6 CBSE Hindi, students can still check their answers by seeking guidance from their teachers, discussing with their peers, referring to their textbook for grammar rules, and utilizing other online or offline resources. It is important for students to actively engage in the learning process and seek assistance when needed to enhance their understanding of the Hindi language.