9. A
10. B
11. B
12. D
13. D
14. C
15. B
16. A
22. C
23. A
24. A
25. B
III,
A.
1. has been -> had been
2. driving -> to drive
3. begin -> began
4. In spite of -> Although
5. since -> from
B.
1. It was a nice surprise to receive your letter.
4. The children decided to go on a picnic at weekend.
5. Before coming to see my friends, I had got my parents’ permission.
6. Because the weather was cold, we kept the fire burning all day.
7. Because he was ill, he had to cancel the appointment.
8. Although the crowd was large, there were enough seats for everyone.
9. A number of students have read this book.
10. She has been shown how to do it.
11. Some of my book have been taken away.
12. The victims have been provided with food and clothing.
14. The window of the laboratory has been changed.
15. The doctor has already been waited for.
