I、单选题(本大题共20小题，共40分)
1.—What’s wrong with you?—I can’t decide ______ next.
A.how to do B.what to do
C.what to do it D.how can I do
2.—Would you mind my smoking here?
— ______.Look at the sign . It says “No smoking.”
A.You’d better not B.No, go ahead.
C.It doesn’t matter. D.Not at all.
3.--Good morning, sir! _________?
