—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 |
There used to _________ a truck _________ and I can't get through.
| A．be；in the way |
| B．be；in a way |
| C．being ；on the way |
| D．being ；by the way |
He _________ live in the country ；but now he has _________ in the city.
| A．used to ； been used to living |
| B．was used to ； used to live |
| C．used to ； been used to live |
| D．was used to ； used to living |
No matter how low you consider yourself, there is always someone _________ you wishing they were that high.
| A．getting rid of |
| B．getting along with |
| C．looking up to |
| D．looking down upon |
Would you please __________ the paper for me and see if there are any obvious mistakes?
| A．look around |
| B．look into |
| C．look up |
| D．look through |
It rained heavily in the south,__________ serious flooding in several provinces.
| A．caused |
| B．having caused |
| C．causing |
| D．to cause |