Antarctic __________ we know very little is covered withthick ice all the year round.
I clean my room once a week, and the job _____ me two hours.
He may not even drink water at night, _______ swallowing insects possibly floating on the surface.
—Excuse me, could you tell me where the post office is? —__________, but I’m a stranger here.
—Mr.Wang was caught in a snowstorm yesterday.—I have known that, and ______ his new car was completely destroyed.
This is the first time that I _____ the summer palace.