The first use of atomic weapons was in 1945, and their power increased enormously ever since.
| A．is |
| B．was |
| C．has been |
| D．had been |
It was reported that 8 policemen were sent to the forest the missing girl.
| A．to search |
| B．to search for |
| C．searching |
| D．searching for |
Scientists are convinced _ the positive effect of laughterphysical
and mental health.
| A．of; at |
| B．by; in |
| C．of; on |
| D．on; at |
--- Smoking is bad for your health.
--- Yes, I know. But I can’t.
| A．give it up |
| B．give it in |
| C．give it out |
| D．give it away |
--- What’s wrong with Mr. Brown?
--- He said he would come at nine, but he didn’tat that time.
| A．show off |
| B．show up |
| C．take up |
| D．make up |