1 . I told you that you shouldn't waste your time playing the computer games,_____________?

A．didn't I

B．did I

C．should you

D．shouldn't you

2 . It was not until the 18th century that man realized that the whole of the brain was involved in the working of the mind，　　　　？

A．was it

B．wasn’t it

C．did they

D．didn’t they