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Ⅰ. 单项填空
1. Amy joined a painting group but didn’t seem to _______ , so she left.
A. show off B. go up
C. fit in D. come over
2. Scientists are convinced ________the positive effect of laughter _______ physical and mental health.
A. of; at B. by; in
C. of; on D. on; at
3. (2012·松原高二检测)Despite the great success of Tiangong-1, experts say, it will be at least ten years _______ our astronauts can land on the moon.
A．while B．before C．since D．until
