21. It’s not _____ good idea to drive for four hours without _____ break.
A. a; a B. the; a C. the; the D. a; the
【解析】选A。考查冠词用法。a good idea 一个好主意；without a break 没有休息。
22. —Would you mind if I turned the TV down?
— _____ .
A. Don’t worry. You’ll get used to it soon
B. No, go ahead
C. Yes, please turn it down
D. Yes, I don’t mind
