21. ---- This is ________ picture I told you about.

   ---- I see. Isn’t it _________ beautiful one?

A. a; a                    B. the; a                C. the; the                    D. a; the

22. Don’t be hard ______ your children and don’t be rude _____ your parents. They are all your friends.

     A. on; to                 B. on; with            C. with; to             D. to; on