Some plants are so difficult to grow that they can only ______ in a perfectly clean environment.
| A．communicate | B．exchange |
| C．survive | D．afford |
Nothing shall _______ me _________ from accomplishing my purpose.
| A．hold , on | B．hold , back | C．hold , up | D．hold , out |
There was ______ time ______ I hated to go to school.
| A．a; that | B．a; when | C．the; that | D．the; when |
We ______ ; we followed the boss into the hall as his guests. How lucky we were!
| A．didn’t need to wait | B．needn’t have waited |
| C．must have waited | D．couldn’t have waited |
It’s just _____among countries to host the Olympics as to win an Olympic Medal.
| A．much as a competition | B．as a much competition |
| C．as much a competition | D．a competition as much |
Do ____ you think is right, ____ difficulties you may have.
| A．what; however | B．that; whatever |
| C．whatever; whoever | D．what; whatever |