fraid you missed a fantastic lecture yesterday. How come you were absent from it—If you _______ know, I asked for a day off and visited a relative of mine in hospital.

_____ heavy rain!– I ____ stay at home ____ go out.

Setting fire to the public buildings ___ highly dangerous and forbidden by law.

The gap between rural and urban education in China is widening, and education is the keyto _____ rural problems. [ ]

Language is changing all the time. Some English words today can mean totally different things to _____ they meant before.