What do you think _____ do to protect wildlife?
| A．should we | B．we should | C．it we should | D．it is we should |
The CDs are on sale! Buy one and you get _____ completely free．
| A．other | B．others | C．one | D．Ones |
——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 |