----I am going to Qingdao and stay there for a week.----______ you are there, would you please buy some books for me?

Hurry up.  The car is coming. Wait a minute, Don’t cross the street _____the traffic lights are green. 

In American, a friend inviting you to a restaurant doesn't mean that he or she will pay for the meal ______ you are told ahead.

I can’t paint well, ________ I like art very much.

I prefer staying at home to going out for a walk.