______be careful when crossing the street!
A: Must
B: Should
C: Ought to
D: Do
A: Must
B: Should
C: Ought to
D: Do
举一反三
- While crossing the street, __________. A: the light might be green B: there are no policemen C: be careful D: it is necessary to be careful
- Be careful when you ________ the street. A: are crossing B: is crossing C: crossing D: is cross
- Only in this way, ______ you do the work well. A: should B: ought to C: can D: must
- You ______ be too careful when you are driving. A: should B: needn't C: cannot D: must
- Be careful when ______ the road. A: [A] crossing B: to cross C: cross