【推荐1】—________ is Guanyun High—speed Railway Station(高铁站)from your school?
—About 10 minutes by bus.

A．How often

B．How long

C．How far

D．How much

【推荐2】--This kind of sports is exciting．
--Yes，but it's dangerous．One can't do it ____ he or she has got some training．

A．if

B．after

C．when

D．Unless

【推荐3】—I’m tired out after working day and night for nearly a month in the Huoshenshan Hospital.
—I’m so proud of you. ________ relax yourself and ________ a good sleep?

A．Why don’t; stop having	B．What about; to stop having
C．Why not; stop to have	D．Why not; stop having

【推荐1】They will not start the work _______ their teacher comes back.

A．while

B．until

C．as soon as

D．if

【推荐2】I couldn’t work out this problem ________ my teacher helped me.

A．before

B．unless

C．because

D．until

【推荐3】Before you get off the bus, you should wait ______ it has stopped.

A．until

B．but

C．because