二、英语知识运用（共两节，满分30分）
：单项填空（共20小题；每小0.5分，满分10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，并在答题卡上将该项涂黑。
21. —Would you like to join me for a quick lunch before class?
—______, but I promised Nancy to go out with her.
A. I’d like to B. I like it C. I don’t D. I will
——Hi, Mike．Any idea where Mary is?
——She ____ in the classroom．I saw her there just now．
| A．shall be | B．should have been | C．must be | D．might have been |
—Have you thought of the topic for the composition?
— Not yet．I _____ it very carefully, but I haven’t decided．
| A．will consider | B．have been considering |
| C．had considered | D．was considering |
The most important thing about cotton in history is _____ part that it played in ____ Industrial Revolution．
| A．/; / | B．the; / | C．the; the | D．a; the |
People have planted a lot of trees and grass in order to ____ wind and sand in the desert．
| A．hold down | B．hold up | C．hold back | D．hold out |
Read the passage and correct the mistakes, ______．
| A．if not | B．if any | C．if ever | D．if never |