It was quite a serious mistake, ____caused by carelessness.
| A．which I think was | B．I think which was |
| C．which I think it was | D．I think which it was |
I don't think we've met before. You're taking me for________.
| A．some other |
| B．someone else |
| C．other person |
| D．one other |
Now researchers say that middle age________be the most fruitful time of life, full of new growth and development.
| A．must |
| B．should |
| C．will |
| D．can |
When asked by the police, he said that he remembered________at the party, but not________.
| A．to arrive; leaving |
| B．to arrive; to leave |
| C．arriving; leaving |
| D．arriving; to leave |
________all over the hills and around the lake are wild flowers of different kinds.
| A．To grow |
| B．Growing |
| C．Grown |
| D．Grow |
As I will be away for at least a year, I'd appreciate________from you now and then________me how everyone is getting along.
| A．hearing; tell |
| B．to hear; tell |
| C．hearing; telling |
| D．to hear; to tell |