The traffic on the main streets has a longer green signal than________on the small ones. (2013·四川，2)
| A．one | B．this |
| C．that | D．it |
Mother wanted to be a good provider, a role she since her marriage to Father.
| A．shoulders |
| B．shouldered |
| C．is shouldering |
| D．has been shouldering |
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 |