Выберите правильное предложение a) which film did they see yesterday? b) when did they saw the film? c) what kind of

1. Which film did they see yesterday?

2. Why are you interested in this subject?

3. What does she usually do in the evenings?

4. How often will they meet at the office?

5. When did they speak English?

6. Who is hungry?

7. Will you keep in touch with them?