These animals are all used to their environment,______, they have learned how to live successfully in their habitat．
| A．however | B．for instance | C．what’s more | D．or rather |
The pilot kept calm in the terrible storm, otherwise the accident ______.
| A．couldn’t be prevented |
B．mustn’t have prevented |
C．wouldn’t have been prevented |
D．shouldn’t prevent |
You _____ pay your library fines. If not, you _____ not be allowed to graduate.
| A．may; should | B．should; need | C．must; will | D．will; can |
If I ________ plan to do anything I wanted to. I’d like to go to Tibet and travel through as much of it as possible.
| A．would | B．could | C．had to | D．ought to |
The boy stood there without _____ a word.
| A．dare to say | B．daring to say | C．dared to say | D．dare say |
—Why hasn’t the speaker turned up?—He _________ the flight. I’ll find it out at once.
| A．must have missed | B．might have missed |
C．would have missed | D．could have missed |