21. Listen! His family must be quarreling, ______?
A. mustn’t it B. isn’t it C. aren’t they D. needn’t they
22. — Do you think the weather is good enough for an outing?
— Yes. You couldn’t hope for ______ at this time of the month.
A. a nicer day B. the nicer day C. the nicest day D. a nice day
23. ______ by the growing interest in nature, more and more people enjoy outdoor sports.
A. To be influenced B. Influencing C. Having influenced D. Influenced
