Most scientists seem to agree that _______ certain limit should be set on _______consumption of cars to ease air pollution．
| A．a; the | B．/;the | C．the; / | D．the; the |
—Could I surf the Internet for twenty more minutes, Mum?
—Oh, dear, if you________.
| A．must | B．can | C．may | D．should |
It’s inner beauty, in my opinion, rather than physical beauty, ____matters in the long run.
| A．how | B．that | C．when | D．which |
—Cathy, what are you going to do this weekend?
—________, I’m going to see my parents in the countryside.
| A．If ever | B．If busy | C．If anything | D．If possible |
According to our school rules, students ________ not carry mobile phones when taking a exam.
| A．will | B．may | C．shall | D．need |
Food safety has become a growing concern. Had the offenders been punished severely enough, the situation________ different now.
| A．will have been | B．would have been | C．would be | D．shall be |