I.
1. slept
2. were
3. Did you drink
4. wasn’t
5. did
II.
1. hasn’t finished
2. haven’t taken
3. Has he sold
4. hasn’t been
5. Have they already left?
III.
1. went
2. have just returned
3. have never seen
4. didn’t work
5. didn’t move
IV.
1. a
2. c
3. c
4. a
5. b
6. b
7. c
8. a
9. b
10. c