Ответ:

1. has improved

2. took

3. has worked

4. haven't seen

5. cleaned

6. hasn't come

7. saw

8. missed

9. have moved

10. have brought

Объяснение:

1 has never improved

2 took

3.Where did he work as a volunteer?

4. haven't seen

5 cleaned

6 hasn't come

7 saw

8 have missed

9 have moved

10 have already brought