17.--Where did they do it?　

　 --I am not sure where ________.

A. they did it　　 B. did they do it　

C. they do it　　 D. do they do it

16.--What does she want?　　

　 --I don't know what ________.

A.　 does she want　 B. did she want　

C. she wanted　　 D. she wants

15.--What is that thing?　　

　 --I don't know what _______.

　　 A.is that thing　 B.was that thing　 C.it is　 D.is it

14.He always thinks of ________ he can work better for the people.

　　 A.what　　 B.which　　 C.why　　 D.how

13.He wanted to know _________ there.

　　 A.how long time I had been　　 B.how long had I been

　　 C.how long time I have been　 D.how long I had been

12.Ask him ____________.

A.　 how old he is　 B. how old is he　

C. how old has he　 D. how old he has

11.--Why is Jack so late?　

　 --I don't know _________be.

　　 what the reason　　 B.what the reason can

　　 C.the reason what can　　 D.what can the reason

10.I wonder ____________.

　 A.how much cost these shoes　 B.how much do these shoes cost

　 C.how much these shoes cost　 D.how much are these shoes cost

8.She ________ that she lives in London.

　 A.said　 B.says　 C.had said D.was saying

　 you tell us _____________.

　　 A.who that man is　　　 B.who is that man　

　　 C.what　 is　 that　 man　 D.whom that man is

7.Now we have learnt ____________.

A.what is heat　 B. whether is heat　

C. when is heat　 D. what heat is