21. Mary was upset last night because she had to do too many homeworks.

A.  was upset            B. because              C. had to do            D. many homeworks

22. Last Tuesday Miss Nhung didn't go to work because her illness.

A.  Last Tuesday       B. didn’t go              C. because              D. illness

23. Collecting coins and stamps were my father’s hobby when he retired.

A.  Collecting             B. were                   C. when                  D. retired

24. I and my friend prefer watching TV to listen to music.

A.  I and                  B. friend prefer         C. watching             D. listen to

25.  The children were so amusing at the cartoon that they couldn’t stop laughing.

A.  were                   B. amusing              C. couldn’t               D. laughing