A. 1. B
2. A
3. A
4. B
5. B
6. A
B. 1. B
2. B
3. B
4. A
C. 1. I have bought...
2. Have you ridden...
3. has walked...
4. have come...
5. Has she written...
6. hasn't started...
7. have we put..
8. hasn't spoken
