The discussion came to life when someone ______ an interesting topic.
| A．came up | B．thought out | C．brought up | D．brought about |
— I was surprised to see wild flowers in Alaska.
— Many people think there is nothing there _______ ice and snow.
| A．but for | B．rather than | C．apart from | D．regardless of |
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 |