In China when caught, those corrupt(腐败的) officials are sometimes limited to __________ in acertain place, only __________ their problems within an appointed time(规定的时间).

It’s important __________ fire.

Susan’s parents bought a large house with aswimming pool. It ______be very expensive.

You used to sleep with the windows open, ________?[ ]

How long will the summer English courses —For six weeks.