21．—Mary works hard at English．

—_______ and_______．

A．So does she; so you do         

B．So she will; so do you   

C．So you do; so does she 

D．So she does; so do you

22．—______ do you think of the book written by Dr．Wang?

—______ my opinion, it is not very interesting．

A．What; By       B．What; In         

C．How; To        D．How; In