—Where did you ______on vacation?   

—I_____to Shanghai.

—Where did you ______on vacation?   
—I_____to Shanghai.

—Where did you ______on vacation?   

—I_____to Shanghai.

1. A.
   went, went.
2. B.
   go; went.
3. C.
   go;go.
4. D.
   went;go

—Jack，could you tell me __?

--Sure.In the post office on Green Road.

A. where you bought the stamps  B. where did you buy the stamps  

C. when you bought the stamps   D.when did you buy the stamps