As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.
| A．exposure | B．distribution | C．expansion | D．emission |
----Must I clean the window now?
---- No, you _____.
| A．mustn’t | B．needn’t | C．can’t | D．may not |
----it’s a long time since I saw my parents.
-----_____ them this weekend.
A why not to visit B. why not visit C. why not visiting D. why don’t visit
I still remember the day _____ I first came to college.
| A．on which | B．in which | C．which | D．that |
Nowadays, more and more young people _____becoming a super girl or a super boy.
| A．agree on | B．dream of | C．wait for | D．get along with |
On April 1, the westerners will play ____ on each other but make sure that no one is hurt.
| A．fun | B．fool | C．jokes | D．games |