In aerospace devices the weight of the necessary power producing equipment is _____.
| A．vital | B．possible | C．capable | D．reliable |
—Where is my dictionary?I remember I put it here yesterday.
—You___it in the wrong place.
| A．must put | B．should have put |
| C．might put | D．might have put |
Many people have come to realize that they should go on___balanced diet and make___room in their day for exercise.
| A．a;/ | B．the;a |
| C．the;the | D．/;a |
A survey of the opinions of experts___that three hours of outdoor exercise a week___good for one’s health.
| A．show;are | B．shows;is |
| C．show;is | D．shows;are |
When asked why he went there,he said he was sent there___for a space flight.
| A．training | B．being trained |
| C．to have trained | D．to be trained |
Scientists are convinced___the positive effect of laughter___physical and mental health.（）
| A． | of;at | B． | by;in |
| C． | of;on | D． | on;at |