一、单项填空（共15小题；每小题1分, 满分15分。）
请从A,B,C,D四个选顶中.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。
1. —Hi, Mary! Do you know where Jim is?
— I think he ________ a lecture in the library.
A. will deliver B. is delivering C. has delivered D. delivered
2. —I’m sorry, but we can’t find your purse in our restaurant.
—________ I seem to lose something every time I eat out.
A. How come? B. Come on! C. Bad luck! D. Pardon me?
3. ________ Sunny Tours, I’d like to welcome you all to my city.
A. On behalf of B. On account of C. In honor of D. In hope of
4. People work through problems in ways ________ they are unaware.
A. of which B. in which C. on which D. to which
5. ________ unusual, this is not the first time the government has chosen to take control of large companies.
A. Since B. When C. Because D. While
6. —May I smoke here?
—Choose a seat in the smoking section, if you ________.
A. should B. must C. can D. may
7. It is a wise father ________ knows his child.
A. that B. which C. what D. whom
8. Knowing ________ you’re good at and doing even more of it creates excellence.
A. where B. which C. what D. that
