We have to work extra hours to finish our plan, _______ the boss can’t allow us to take a day off tomorrow.
| A．so | B．or | C．and | D．but |
To lose weight, Mr White______ hiking as a regular form of exercise after he retired.
| A．caught on | B．took up | C．set out | D．made for |
The more one is_______ the English-speaking environment, the better he or she will learn the language.
| A．exposed to | B．filled in | C．caught on | D．kept up |
It’s time that you_____with the relief work in the flood-stricken area after the awful typhoon.
| A．must help | B．can help | C．helped | D．have helped |
Drunk driving, which was once a frequent occurrence, is now______.
| A．under debate | B．under control | C．under construction | D．under investigation |
_____snacks and drinks, but they also brought cards for entertainment when they had a picnic in the forest.
| A．Not only did they bring | B．Not only they brought |
| C．Not only brought they | D．Not only they did bring |