21. --- I think you’d better type this letter again before Mr. Smith see it.
--- Oh, dear! _____.
A. Who cares? B. No problem C. I don’t mind at all D. Is it as bad as that?
22. My English teacher’s humor was ____ make every student burst into laughter.
A. so as to B. such as to C. such that D. so that
23. Isn’t it amazing how the human body heals ____ after an injury?
A. himself B. him C. itself D. it
24. I hear they’ve promoted Tom, but he didn’t mention _____ when we talked on the phone.
A. to promote B. having been promoted
C. having promoted D. to be promoted