—          didn’t they want foreign engineers（工程师）.

—Because they wanted a Chinese engineers.

        A、When    B、Where    C、Why    D、How

--- Didn’t the sleeping pills work?

　　 --- ______. I slept well last night.

A. Yes, they do　　　　

B. No, they don’t

C. No, they didn’t　　　　

D. Yes, they did

I didn't know ________.

1. A.
   what they do
2. B.
   what they did
3. C.
   what do they do
4. D.
   what did they do

They had to wash it for him, ________ they?

1. A.
   hadn't
2. B.
   weren't
3. C.
   didn't
4. D.
   haven't