38.
cause,much,harm,follow,worried |
Many people use stoves to keep their homes warm.Scientists are becoming(1)
because most homes burn coal to keep warm and the smoke from these houses is(2)
air pollution.There are many(3)
things in the smoke.Smoke is mainly made up of a kind of tiny(微小的)little black thing called soot(煤煙).Too(4)
soot will be dangerous for people.Factories produce most smoke and soot,but the government thinks that all types of burning should be cut down.Home owners may have to build new stoves in order to(5)
the new law,or they won't be able to keep warm in cold days.