Scientists are convinced___the positive effect of laughter___physical and mental health.（）
| A． | of;at | B． | by;in |
| C． | of;on | D． | on;at |
Only through ______ talks can we build trust and only through cooperation can we create _______ win-win economic situation.
| A．\, a | B．the, the | C．\, the | D．the ,a |
I thought she had retired, but ________ she hasn’t.
| A．ordinarily | B．usually | C．apparently | D．fortunately |
Great changes have taken place in that school. It is no longer ___ it was 20 years ago, ___ it was so poorly equipped.
| A．what, when | B．that, which | C．what, which | D．which, that |
The doctor recommend he _________ a few more days in hospital.
| A．stays | B．to stay | C．stay | D．would stay |
—I suggest we set up an out-of-class club.
—Great! That’s exactly what I ______.
| A．was thinking | B．think | C．had thought | D．will think |