The more one is ______ the English-speaking environment, the better he or she will learn the language.
| A．kept up | B．filled in | C．caught in | D．exposed to |
I'd better not catch ______ that again !
| A．your doing | B．you doing | C．you to do | D．you being doing |
I posted the letter some time _____ the week .
| A．in | B．during | C．throughout | D．within |
Take a taxi , _____ you'll miss your train .
| A．and | B．if | C．otherwise | D．or |
If you _____ stop smoking , you can only expect to have a bad cough .
| A．won't | B．would not | C．do not | D．can not |
There must be _____ book which could help .
| A．some | B．any | C．one | D．one useful |