-Did you visit the museum last week?
-No, we __________，but we spent too much time shopping.
| A．could have |
| B．could |
| C．must have |
| D．must |
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 |
28. I don’t think you’ve quite__the seriousness of the situation. You seem to know nothing about it.
| A．recognized | B．mastered | C．grasped | D．Seized |