二、单项填空 (共15小题；每小题1分，满分15分)
请从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该选项的标号涂黑。
例：A computer can only do ________ you have instructed it to do.
A. how B. after C. what D. when
答案是C。
21. — Do you think our math teacher will free us of homework this week? Our yearly sports meeting starts tomorrow.
— ________ ! After all, we are already Senior 3 students.
A. No problem B. Forget it C. No dream D. I hope so
22. — Did Jenny return early last night?
— Exactly. It was not yet nine o’clock ________ she arrived home.
A. before B. until C. that D. when
23. — Hey, man! Why so tired?
— I ________ for weeks for the coming celebration of the school’s 100th anniversary.
A. was preparing B. have been preparing
C. had prepared D. was prepared
24. Such shocking news made me realize ________ terrible problems we would face.
A. what B. how C. that D. why
25. ________ everyone here, I wish you a pleasant journey back to your country.
A. By means of B. On behalf of C. In search of D. For fear of
26. As we know, our “Chinese Dream” is ________ dream to improve people’s life and ________ dream of harmony, peace and development.
