I usually sleep with the window open _____ it's really cold．（ ）
A．ifB．becauseC．soD．unless
The movie____I have seen twice is The Wandering Earth．（ ）
A．whoB．whichC．whereD．when
We are supposed____some housework with our parents when we have free time．（ ）
A．to shareB．sharingC．sharedD．share
Tom watched the World Cup ____11：30 last night．（ ）
A．WhenB．unlessC．untilD．as soon as
Peter with his classmates____ for the bus when the earthquake happened．（ ）
A．is waitingB．was waiting
C．are waitingD．were waiting
﹣____is it from Lanzhou to Lhasa？
﹣It's about 2，160 kilometers．（ ）
A．How oftenB．How farC．How longD．How many