一、单项选择（共15题,每小题l分，共15分）
在下列各题A、B、C、D四个选项中选择一个最佳答案。
( )1. --- Who helped you clean the classroom yesterday?
--- _______. I cleaned it all by myself.
A. Everybody B. Somebody C. Nobody D. Anybody
( )2. His father often tells him _______ in that river because it’s dangerous.
A. not to swim B. not swim C. swim D. to swim
( )3. --- I feel tired and sleepy.
--- Why not stop ______?
A. relaxing B. to relax C. resting D. to work
( )4. Jack is very ______and he never shares his things with others.
A.clever B.kind C.generous D.selfish
( )5. Though the work is very hard, he doesn’t want to_______easily.
A. give in B. give up C. give away D. give over
