You ______ take responsibility for the mistake, since it was not your fault.
A. mustn't
B. have not to
C. couldn't
D. don't have to
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__________ you show me how to do the addition, Mr. Wang?
A. May
B. Could
Can
Do
_______ I have a look at your passport, sir?
A. Should
B. Do
C. May
D. Would
-- Must I hand in the homework on Monday?-- _____________ it's on Tuesday.
A. Yes, you must.
B. Yes, you have to.
C. No, you mustn't.
D. No, you don't have to.
沟通礼仪的原则有( )
A. 敬人
B. 自律
C. 适度
D. 真诚