_____ China’s reform and opening up in late 1978, its quick development has aroused worldwide attention, which has made America anxious about it.
| A．When | B．As | C．While | D．Since |
Neither of them thought highly of him and they both tried to _____ him in his work.
| A．hamper | B．support | C．assist | D．encourage |
They have been waiting for many hours to see the singer, but the airplane must have been _____.
| A．behind the times | B．behind schedule |
| C．ahead of time | D．in no time |
The thief _____ the papers all over the room while he was searching.
| A．abandoned | B．vanished | C．scattered | D．deserted |
Pack the cake in a strong box, or it might get _____ in the post.
| A．splashed | B．spilt | C．crushed | D．crashed |
. Professor Smith and Professor Brown will _____ in giving the class lectures.
| A．exchange | B．alter | C．shift | D．alternate |