—Where _____ Mary have put the empty bottles?
— She _____ them away. They must be somewhere.
| A．can; can’t have thrown | B．must; needn’t |
| C．must; must have thrown | D．can; mustn’t have thrown |
Before driving into the city, you are required to get your car ________.
| A．washed | B．wash | C．washing | D．to wash |
I looked up and noticed a snake ________ its way up the tree to catch its breakfast.
| A．to wind | B．winding | C．wind | D．wound |
When ________ for his views about his teaching job, Philip said he found it very interesting and rewarding.
| A．asking | B．having asked | C．asked | D．to be asked |
As many as five courses are provided, and you are free to choose ________ suits you best.
| A．whichever | B．whatever | C．whenever | D．wherever |
Interest is as ________ to learning as the ability to understand, even more so.
| A．similar | B．vital | C．available | D．specific |