---Can you tell me why you learn English so well ? ---It is very simple. _______ you work, ______ grades you will get.
Don’t ___________ before the bus stops.
Teenagers like to photos of famous stars in their bedrooms.
---Would you like to climb the hill with us tomorrow? --- If it , I .
When he walks_______ my desk,he knocked my books________ the floor.
--The World No Car Day is ________ September 22nd. --Yes, many volunteers ride along the street to ask people to stop car.