21. The earthquake happened _____ 2:28 ______ May 12th.【版权所有：21教育】
A. in, on B. at, on C. at, in D. on, on
22. Bob is a clever boy, ______ he doesn’t study hard at his lessons.
A. so B. and C. but D. because
23. Ms Wang teaches _______ math this term.
A. us B. our C. we D. ourselves
24. In my school there are _______ students.
A. three thousands B. three thousand of
C. three thousands of D. three thousand
25. Don’t ______, Lucy. If you keep on, you can be successful.21教育名师原创作品
A. turn off B. put off C. put on D. give up
26. David _______ home for a week. His parents are worried about him.
A. has left B. has been away from C. left D. was away from