A.
1. a-1, b-2
2. a-2, b-1
3. a-2, b-1
4. a-1, b-2
b
1. am eating
2. isn't wearing
3. goes
4. am studying
5. look
6. visit
7. are working
8. does like
c
2. I'm checking
3. do you check
4. I usually check
5. is travelling
6. Does send
7. she's travelling
8. Is she going on
9. Doesnt like
10. prefers
11. is driving
12. Is it
13. There are