二、 单项选择 1. — ____ can I keep the book? —Two weeks. A. How often B. How many C. How long D. How soon 2. Tom is showing his friends ____ his house. A. to B. in C. on D. around 3. — Are Sam and Tony reading in the library? — No, ___. A. they are B. they aren’t C. they do D. they don’t 4. My sister usually ____ some cleaning after work. But now she ____ songs. A. do; sings B. doing; singing C. does; is singing D. is doing; sings 5 . Very ____ students ride bikes to school in America. A. a few B. few C. a little D. little