The overseas Chinese scientist made another wonderful discovery, ___________ of great value to study AIDS.
| A．which I think it is | B．which I think is | C．I think it is | D．I think is |
Good friends as we are, I still find her difficult to understand ________.
| A．at one time | B．at a time | C．at times | D．at the time |
We are onlyglad to do anything we canher.
| A．very; helping | B．very; help | C．too; help | D．too; to help |
What he did ______ what he said moved us.
| A．more than | B．other than | C．rather than | D．no more than |
Lucy was completely ______ after jogging in the hot sun all afternoon; she had little energy left.
| A．kicked out | B．worn out | C．handed out | D．put out |
---where have you been?
---I___in the heavy traffic, or I would have been here earlier.
| A．stuck | B．had stuck | C．have been stuck | D．got stuck |