21. _____, the great mother, in order to save her sick child, kept waiting for four hours in the heavy snow.
A. It depends B. Take it easy
C. Believe it or not D. It is OK
22. As we all know, many Chinese words have come into English, ______ typhoon, tofu and kung fu.
A. for example B. that is
C. such as D. so as to
23. Nobody knows the man killed in the accident, so it is difficult for the police to find out his _____.
A. thought B. height C. weight D. identity
