二、单项选择（每小题 1 分，共 15 分）：
21. He’ll call me when he arrives __________ London.
A. to B. in C. at D. /
22. My bedroom is very beautiful and __________.
A. quietly B. quiet C. quite D. quitely
23. Look! There is a kite flying __________ the river.
A. on B. over C. in D. about
