21．—Are you going to take part in the speech contest?
—________ It's too good an opportunity to miss.
A. No problem! B. That's for sure.
C. Why me? D. Why bother?
[解析]句意：——你计划参加演讲比赛吗？——那当然。这个机会很难得，不能错过。No problem！用来回答感谢或要求，意为：不成问题，没关系；That's for sure.对上文或对方所说的话表示肯定，意为：当然；Why me？为什么是我呢？Why bother？为什么浪费时间(精力)？根据句意可知答案为B项。
[答案]B
22．—Do you have Mary's phone number?
—Sorry, ________.
A. I don't know B. forget it
C. here you are D. I can't remember it
[解析]句意：——你有玛丽的电话号码吗？——对不起，我记不起来了。A项(我不知道)为汉语式英语，故被排除；B：没关系，不必在意，别提了；C：给你。以上三项均不符合句意，故被排除。只有D项(我记不起来了)符合本题要求，故为答案。
[答案]D
