The key answer of exercise 1

a)

1. been
2. didn't do
3. was
4. Have you
5. is being
6. Did you have
7. Had you

b)

1. MV
2. AV
3. MV
4. MV
5. AV
6. AV
7. AV
8. MV

c)

1. do; don't; doing
2. weren't; was having
3. Did; wasn't; have
4. Have; done; don't; doing
5. Had; was
6. Have; done; 'm; doing
7. was; 've
8. Have; had; 'm
9. Has; 've been; isn't
10. Have; had; didn't / don't

d)

1. How long have you had your car?
2. Do you do housework every day?
3. How long have you been learning English?
4. Did you do any exercise yesterday?
5. Have you every been to New York?
6. What are you doing / going to do next weekend?
7. Where were you at 10 a.m. this morning?
8. When was the last time you had your hair cut?