1.During the examination, students______ keep silent and focus on their own papers.
A. need B. can
C. might D. have to
2.Your English is improving. It is getting ______.
A. well B. good
C. clearly D. badly
3.She felt upset afler she broke _____ with one of her close friends.
A. up B. in
C. out D. down
4.We all find it necessary ____ a foreign language such as English.
A. master B. to be mastered
C. to master D. mastering