21. In ______ eyes of my parents, a knowledge of English is ______ must in the world today.
A. the;不填 B. the; a C.不填; a D.不填;不填
22. Different from girls, boys are likely to be ______ about sharing their feelings with their close friends.
A. cautious B. positive C. curious D. enthusiastic
23. It is reported that China will not buy the Euro debt until some thorough research ______.
A. will be done B. had been done
C. has been done D. will have been done
