----Why did you just sit and watch？
-----You _______ me.
| A．could help | B．should help |
| C．could have helped | D．must have helped |
33. There was no light in the dormitory last night. So, they ________ to the lecture then.
| A．must have gone | B．should have gone |
| C．needn’t have gone | D．couldn’t have gone |
32. After he left college, he was employed in an international company and _______ there ever since.
| A．worked | B．has worked | C．had worked | D．was working |
31. A large sum of money has been raised for the ____________ of the poorly-educated children in the mountainous districts.
| A．profit | B．favor | C．advantage | D．Benefit |
30.Little__ that we were watching his every move, so he seemed to be going his own way in this business.
| A．he realized | B．he didn’t realize | C．did he realize | D．didn’t he realize |
29. The nutrients in _____falls into the ocean will quickly become available to other living creatures.
| A．whichever | B．that | C．whatever | D．Wherever |