二、单项选择(共5小题,每小题2分,共10分) 从下面每题ABCD四个选项中,选出可填入空白处的最佳选项。 1.All the police _____ on that special day. A .were working B .was working C.is working D . are working 2. -Must I hand in my homework today? -No. you_____. A. mustn't B.can't C .needn 't D. don t 3. Tom is my friend and Mary is____girlfriend . A .he B. he's C. him D. his 4. When you are____trouble ,I'll help you. A .with B. in C. of D. after 5.You must get up now,_____ you can get there on time. A.so B.and C .because D. so that