46.— May I ask you a question?

46.— May I ask you a question?
— ______________
A.Yes,do it B.Yes,please.C.Yes,all right.D.Yes,say it.
47.— Doctor,what’s the matter with me?.
— ____________
A.You are terrible.B.I’m afraid I can’t tell you
C.Very well.D.Nothing serious.You look fine.
48.— The pollution is becoming more and more serious.I’m really worried about it.
— ____________.
A.I feel no way how to do B.I feel nothing of it.
C.I feel at a loss what to do D.I feel at ease about it
49.— I like collecting stamps,what about you?
— ____________
A.So do I.B.I do so.C.So I do.D.I so do.
50.— Could you recommend a secretary for me?
— _____________
A.I have no one to give you B.I don’t like Susan
C.I think Susan is a suitable person.D.I don’t know