Ex6
1.have written
2.has been
3.hasn't visited
4.have already watered
5.have you been

Ex7
1.have never watched
2.watched
3.has read
4.read
5.had
6.have had

EX8:
1. A
2. B
3. C
4. C
5. D
6. C
7. B
8. D

EX9:
1. went
had finished
2. had done
saw
3. thanked
had done
4. was
had hurt

Ex5
1.was
2.watched
3.ate
4.did you live/lived
5.didn't stay
Ex6
1.have written
2.has been
3.hasn't visited
4.have already watered
5.have you been
Ex7
1.have never watched
2.watched
3.has read
4.read
5.had
6.have had
EX8:
1. A
2. B
3. C
4. C
5. D
6. C
7. B
8. D
EX9:
1. went
had finished
2. had done
saw
3. thanked
had done
4. was
had hurt