The number of the employees has grown from 1,000 to 1,200. This means it has risen ____ 20 percent.
| A．by | B．at | C．to | D．with |
Silk from China found its way to India, the Middle East and Rome, _______ spices and glass, which was not known to China.
| A．in exchange for | B．in return | C．in change for | D．in need of |
Li Yang, the founder of Crazy English, says that he copies it down _______ he comes to a sentence.
| A．unless | B．while | C．because | D．every time |
This is the third time I _______ Beijing. The second time I ______ here was on Christmas Day last year.
| A．have visited; came | B．have visited; have come |
| C．visited; came | D．visited; have come |
Computers can do a lot of things nowadays, but _____ more still need to be done by man.
| A．a large amount of | B．a great deal |
| C．a good many of | D．a great many |
Lectures were _____ so students could be more focused on their study for the finals.
| A．called off | B．broken off | C．blown off | D．set off |