---- ____?   

   ---- Maybe the possible solutions to the air pollution.

   A. Do you think what they are talking about

   B. Do you think what are they talking about

   C. What do you think they are talking aobut

   D. What do you think are they talking about

Where???? go to spend our summer vacation this year?

A.do you think can we? B.do you think we can

C.you think can we???? D.you think we can

＿＿＿＿＿ heat is different from temperature?

A.How do you think     B.How you think  C.What do you think     D.What you think

___ Mary is going to marry?

   A. Who do you think    B.Do you think who   C.Who you think   D.Does you think who

4. — ﹍﹍is the best football player in your city?

   —Jerry.

A. Do you think who

B. Do you think whom

C. Who do you think

D. Whom do you think