给下列的问句选择合适的答语。 ( ) 1. How do you go to school? ( ) 2. Where is the library? ( ) 3. Who's she? ( ) 4. When are you going? ( ) 5. What are you going to do? A. I'm going to buy a book. B. I go to school on foot. C. It's in front of the school. D. She's my aunt. E. This afternoon.