随着英语的普及，学好英语成了大学生最大的目标。为帮助大家轻松掌握专业知识，特提供以下资料：
1. Mike, you__1__play with fire. You__1__ burn yourself.
A. won’t; can’t
B. mustn’t; may
C. don’t have to; must
D. have got to; shouldn’t
2. You__2__see the doctor, Joe. You don’t look very well.
A. must
B. shall
C. may
D. can
3. —Must I clean the window now?
—No, you__3__
A. mustn’t
B. needn’t
C. can’t
D. may not
4. Jack’s ill, so they__4__change their plans.
A. must
B. should
C. have got to
D. ought to
5. Harry has been reading all day —he__5__be tired.
A. should
B. has got to
C. has to
D. must
Key 1: 1-5 BABCD