27.If you want to learn about Liu Xiang,let me know,_____ yo

27.If you want to learn about Liu Xiang,let me know,_____ you?
A.don’t B.will C.shall D.do
28.Mrs.Black doesn’t believe so many people are suffering from this tsunami,_____?
A.aren’t they B.are they C.doesn’t she D.does she
29.I don’t think he could have done such a stupid thing last night,_____?
A.do I B.could he C.did he D.has he
30.—Why is Tom absent?
—He must be sick,_____?
A.isn’t he B.must he C.is he D.mustn’t he
31.It’s the first time that she has been to the United States,_____?
A.isn’t she B.isn’t it C.hasn’t she D.hasn’t it
32.When the disaster struck,many people had no time to escape being killed,_____?
A.didn’t they B.did they C.did it D.didn’t it
33.Nowadays in China some officers are unfit for their positions,_____?
A.are they B.aren’t they C.don’t they D.do they
34.Protecting the South China tiger from dying out takes a long time,_____?
A.doesn’t it B.don’t they C.does it D.do they