It is not yet known how these huge stones were conveyed a distance of 380 kilometres 3 000 years ago.
| A．at | B．for | C．over | D．in |
—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 |
—What do you think of the concert given by the famous Hong Kong singer?
—Not so good．In fact, it _____ to be a great disappointment.
| A．turned up | B．turned in | C．turned down | D．turned out |