We were deeply impressed by the schools ______ we had visited in this city.

lish class, our teacher often creates anenvironment _____ we are given the opportunity to solve problems ourselves.

How do you think of Steve Jobs whosucceeded in creating the empire of Apple—I think the most important is that hehad intelligence ______the ordinary.

Is Mr. Smith over there—-It _____be him .He has gone to Beijing on business.

Bears often hide themselves in places__________ can’t be found by hunters.