Наверное, нужно задать вопрос, т.к. в скобках стоит вопросительное слово.

1. How does my mother clean the house?
2. What man is nice?
3. When are John and Dick playing tennis?
4. When do they run for the bus?
5. What job does *непонятное имя* have?
6. What table is there in the middle of the room?
7. When did the Normans invade Britain?
8. Who did discover America in 1492?
9. How often does she do her room?
10. Where were they last night?
11. When can be the work done?
12. Where will be a new station?
13. How did she do her work last week?
14. When has the contract been signed?
15. Не видно слова в скобках до конца, напиши.
16. What is he doing today?
17. Не видно слова в скобках до конца, напиши.
18. Where did Steve phone?
19. When does it often rain in the county?
20. How long have I been doing their work?