Prof. Richard was crazy about his research. His illness_________ his many years of hard work and irregular diet.
| A．led to | B．resulted in | C．accounted for | D．got around |
Why did so many people stand by while the woman __________ in broad daylight?
| A．is being robbed |
| B．had been robbed |
| C．was being robbed |
| D．has been robbed |
We are confident that the environment __________ by our further efforts to reduce pollution.
| A．had been improved |
| B．will be improved |
| C．is improved |
| D．was improved |
I didn't think I'd like the movie, but actually it __________ pretty good.
| A．has been |
| B．was |
| C．had been |
| D．would be |
Shakespeare's play Hamlet __________ into at least ten different films over the past years.
| A．had been made |
| B．was made |
| C．has been made |
| D．would be made |
A big fire __________ last night. Who should __________ for it?
| A．took place; be to blame |
| B．was broken out; be to blame |
| C．happened; be to be blamed |
| D．broke out; be to blame |