21. Ricky stepped forward to ______ front of the stage and began to sing in _____ loud voice.
A. 不填; a B. the; a C.不填; the D. the; the
22. After the treatment, her hair started falling out, and she was _______ to stares from passers-by.
A. sensitive B. curious C. eager D. cautious
23. ____and popular gives one a sort of feeling that nothing can replace.
A. Being needed B. Having needed C. Needing D. To have been needed
