Scientists are convinced ___ the positive effect of laughter ____ physical and mental health.
| A．of; on | B．by; in |
| C．of; at | D．on; at |
Mr. Reed made up his mind to devote all he had tosome schools for poor children.
| A．set up | B．setting up |
| C．have set up | D．has set up |
I didn’t know the girl youthe sheep.
| A．had fed | B．had her fed |
| C．had feed | D．had to feed |
The company has made it clear that any application form ______ until now properly will not be accepted.
| A．not having been filled | B．not filled |
| C．not being filled | D．not to be filled |
At the seventh International Ballet Competitions , Fernando Bujones won the first gold medal ever ___to an American male dancer .
| A．awarded | B．to be awarded |
| C．being awarded | D．should be awarded |
I bought three books, but none of _______ is interesting.
| A．which | B．that | C．what | D．them |