As a result of destroying the forests, large ____ of desert ____ covered the land.
| A．number; has | B．quantities; has | C．number; have | D．quantities; have |
_____people who learn Engiish as a foreign language ________more than 750 million.
| A．A number of... reach | B．The number of...come to |
| C．The number of... reaches | D．A number of...comes to |
Rather than ________at home watching TV, I'd prefer_______in the office.
| A．working...staying | B．working...stay |
| C．to work...stay | D．work...to stay |
To the parents' worry, some middle school students are _______ computer games and completely forget their studies.
| A．crazy about | B．burying in | C．very proud of | D．tired of |
His sister left home in 1998, and _______ever since.
| A．has not heard from | B．had not heard from |
| C．has not been heard of | D．had not been heard of |
I couldn't do my homework with all that noise
| A．to go on | B．goes on | C．went on | D．going on |