----Excuse me . Have you got an eraser ? ----Sorry , I haven’t . Why __________you ask Mary ?
David talked with a friend of ________ on the Internet for a long time yesterday.
---You are a good boy!--- .
I can’t find backpack. Can you help ?
Yao Ming was born September 12, 1980.
After I ______ my homework, I went out to an aquarium.