I/
1. lost
2. has been
3. lost
4. was
1. arrived
2. was waiting
3. wore
4. looked
II/
1. in
2. of
3. unless
4. on
5. of
6. who
7. for
8. if
III/
1. B
2. C
3. D
4. C
5. B
IV/
1. It was such an unexpected remark that she didn't know what to say.
2. No one in the world plays guitar more badly than you.
3. I needn't to write that letter.
4. The man in chief suggested everything once more.
5. Contrary to the fish's harmless appearance, it is quite dangerous.
6. What a good sense of humor you have, teacher!
7. Vietnam is acknowledged to have had a complete control over SARS from a very early stage of the epidemic.
8. He forgot anything about it, and neither did she.
9. If it hadn't been for our father's encouragement, we couldn't have managed it.
10. It is a pity that I didn't apply for that job.
