If you want to study in foreign countries, ____ good knowledge of the culture is regarded as ____ must for you to live happily.
| A．/; / | B．a; a | C．the; the | D．the; a |
In our class, the student leaders are on ______ duty every ______ few days.
| A．the; a | B．a; the | C．a; a | D．不填; 不填 |
—You look so upset, Isabelle.?
—I failed to pass the driving test last week.
| A．What's up | B．What's for | C．What are you up to | D．So what |
Bicycling is good exercise; ____, it does not pollute the air.
| A．nevertheless | B．besides | C．otherwise | D．therefore |
Mary is really good at taking notes in class. She can almost every word her teacher says.
| A．put out | B．put down |
| C．put away | D．put together |
When ________ questions in class, one should answer them as clearly as possible.
| A．asking | B．to ask | C．to be asked | D．asked |