一、单项填空 在A、B、C、D四个选项中, 选出可以填入空白处的最佳选项。
(本大题共15分，每小题1分)
1. This is _______ usual way of solving the problem. Can you think of ________ unusual way?
A. a; a B. a; an C. an; an D. an; a
2. Some of the CDs belong to her, while the rest are ________.
A. my B. your C. his D. our
3. He ________ whether he will be able to win the tennis match. So he feels very nervous.
A. believes B. thinks C. doubts D. hopes
4. It’s so silly ________ people to buy and store so much salt. It’s necessary ________ them to learn more about salt.
A. for; for B. for; of C. of; of D. of; for
