Scientists are convinced _______the positive effect of laughter ______ physical and mental health.
| A．of ; at | B．by ; in | C．of ; on | D．on ; at |
Not until he retired from teaching three years ago having a holiday abroad.
| A．he had considered | B．had he considered |
| C．he considered | D．did he consider |
Don't handle the vase as if it ________made of steel.
| A．is | B．were | C．has been | D．had been |
One of our rules is that every student wear school uniform while at school.
| A．might | B．could | C．shall | D．will |
The new movie____________ to be one of the biggest money-makers of all time．
| A．promises | B．agrees | C．pretends | D．intends |
Rod loves ________ clocks. However, he never manages to put them together again.
| A．taking apart | B．giving away | C．making up | D．turning off |