The women carrying babies, come in first,_____ ？

A. will you    B. will they    C. don't they    D. didn't they

As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?

A．do they                               B．don’t they

C．don’t you                            D．isn’t it

I don’t think anyone can finish the experiment, ____?

   A. do I        B. can they       C. can’t they         D. don’t I

__________, they couldn’t make her change her mind.

A.Hard as they tried

B.Tried hard as they

C.As they tried hard

D.They tried as hard

The news that they failed their driving test discouraged him, _____??

A.did they?

B.didn’t they?

C.did it?

D.didn’t it?