Could you ___the radio a little? It’s too noisy.
| A．turn on | B．turn down | C．turn off | D．turn into |
_____ on everyday practice, progress in English is a goal which can be achieved．
| A．Based | B．Basing | C．Having based | D．Being based |
Look out! Keep away from the house, _____ the roof is under repair．
| A．whose | B．which | C．of which | D．where |
．You’d better get the problem solved as soon as possible ______ it becomes out of control．
| A．when | B．before | C．since | D．unless |
—Happy Birthday, Ken! Did you invite Jason?
—Yes, but he _____ a meeting in New York otherwise he wouldn’t be absent from my birthday party．
| A．is attending | B．has attended | C．was attending | D．attended |
—Mom, can I have that transformer?
—Behave yourself and you____ have it．
| A．could | B．shall | C．must | D．may |