I always had doubts he would be the best man for the job , but now I don’t doubt he can do it.
| A．whether; whether | B．that ; if |
| C．if; whether | D．whether; that |
Here is so difficult a problem_______none of us can solve.
| A．which |
| B．that |
| C．as |
| D．what |
Is this museum _______ we visited last week?
| A．the one |
| B．that |
| C．where |
| D．in which |
It is not a serious illness. So I guess she will_______soon．
| A．remove |
| B．recover |
| C．replace |
| D．reduce |
We never dared to ask him a question, _______ ?
| A．did we |
| B．didn’t we |
| C．dared we |
| D．daren’t we |
It _______ . Some effort has been made to get DPRK to the table of six-party talk.
| A．worth |
| B．worth trying |
| C．is worth to try |
| D．is worth it |