The professor warned the students that on no account _____________ use mobile phones in his class.
| A． |
should they |
B． |
they should |
C． |
dare they |
D． |
they dare |
Tsinghua University, in 1911, is home to a great number of outstanding figures.
| A．found | B．founding |
| C．founded | D．to be founded |
I waited for him at the train station for an hour and I was afraid that he may miss the train, but luckily, he showed up with only ten minutes ______.
| A．remain | B．to remain |
| C．remained | D．remaining |
Three photos of a school teacher saving two children in a lake have been posted online on October 10, ________ heated discussions on Weibo immediately.
| A．to raise | B．raising |
| C．Having raised | D．raised |
Nuclear radiation is said __________ the biggest health challenge in Japanese Earthquake over the past few months．
| A．being | B．to be |
| C．to have been | D．that it is |
Tom’s English is not good, so he devoted all his free time to __________ it.
| A．studying | B．study |
| C．studied | D．studies |