21. – What’s the matter? You really look down.

– _________.

A. Why, I always look up to you

B. Me? I never look down upon anybody

C. I am looking for my pen on the floor

D. I failed an important test

22. He is so happy _________ his father has promised to buy him an MP5 player.

A. that ¡¡            B. while                C.which ¡¡          D. because