-----I have to go now. -----It is raining .Don’ t ______ until(直到) the rain stops.
This kind of computer ________ too much. I can’t afford one.
Luckily, all the students got out of the teaching building _ it fell down.
—How are you going to the train station to meet your aunt? —I'm going there ______ my car.
By _______ way, is _______ man in _______ red your brother?
I don't know when ______.