The river _____ are covered with trees is very long.
| A．whose bank | B．of which banks | C．whose the banks | D．the banks of which |
Only after spending several nights working on the math problem to wonder whether the problem was wrongly set.
| A．had he begun | B．he began | C．did he begin | D．began he |
I can’t persuade him out of playing computer games. He is to them.
| A．reminded | B．accustomed | C．addicted | D．stuck |
______ by a greater demand of vegetables, farmers have built more green houses.
| A．Driven | B．Being driven | C．To drive | D．Having driven |
It is reported that the floods have left about _________ people homeless.
| A．two thousand | B．two-thousands | C．two thousands | D．two thousands of |
When you get the paper back, pay special attention to what ________.
| A．have marked | B．have been marked | C．had marked | D．had been marked |