I need to call my friend David coat I took away by mistake yesterday.

Don’t get off the bus __________ it stops.

n environment can help the city bid for the Olympics, which____ will promote its economic development.

Who telephoned you just now— don’t know. I was about to answer thephone when it ________.

Though famous all over the world, Yuan Longping, sunburnt, ______ with his simple life and ____ in plain clothes, is still busy with his experiment to improve his super-hybrid rice [ ]