1. Economics (is) his favourite subject.
2. The trousers he bought for her (don’t) fit her.
3. The police (want) to interview men about the robbery.
4. Physics (was) my best subject at school.
5. Can I borrow your scissors? Mine (aren’t) sharp enough.
6. The news (wasn’t) as bad as we expected.
7. Where (does) your family live?
8. Four days (isn’t) long enough for a good holiday.
9. He can’t find his binoculars. Do you know where (they are)?
10. Do you think the people (are) happy with the government?
11. (Do) the police know how the accident happened?
12. She doesn’t like hot weather. Twenty-eight degrees (is) too
warm for her.
13. The staff at school (are) not happy with their new working
conditions.
14. Thirty thousand pounds (was) stolen in the robbery.
15. Two years (is) a long time to be without job.
16. Five miles (is) a long way to walk every day.
17. I need more money. Six pounds (is) not enough.
18. These species (are) very rare.
19. My hair (is) dark brown.
20. His watch (needs) repairing.
2. keeping - часть составного сказуемого, watching - часть составного сказуемого;
3. controlling - определение.