30. It was once called the Sea of Bamboo, but now only one fifth of the area ______ covered with bamboo, and sixty percent of other plants ______ taken the place of the bamboo.
| A．are; have | B．is; has | C．is; have | D．are; has |
31. The farmers wondered if vegetables bring in______crops.
| A．as many as | B．as good as | C．as much as | D．as well as |
30. This dictionary is of great use, which can help you_________many problems about words and idioms.
| A．keep up | B．clear up | C．look up | D．take up |
29. The________you sign your name can tell experts a lot about you.
| A．choice | B．method | C．means | D．way |
28. Hello, you_______5678234, I’m sorry but I am unable to answer your questions right now.
| A．reached | B．are reaching | C．have reached | D．had reached |
27. After the flood, no house in the village______ .
| A．left standing | B．was left to stand | C．was remained | D．remained standing |