1．(教材P32)Scientists have tried many ways to__solve(solve) this problem and in China, a mass campaign has been started to__help(help) solve it.
2．(教材P32)They are often so thick that you cannot see the sun, and the wind is sometimes strong enough to__move(move) sand dunes.
3．(教材P32)There was nothing to__be__done(do). It was the most frightening and the most dangerous situation I’ve ever been in.
4．(教材P32)Sandstorms in China appear to__have__increased(increase) in recent years as a result of “desertification”．
5．(教材P32)The storms sometimes continue all day and traffic moves very slowly because the thick dust makes it difficult to__see(see)．
6．(教材P32)When a sandstorm arrives in the city, weather experts advise people not to__go(go) out.
7．(教材P32)The winds are very strong. It’s difficult to__breathe(breathe) and the dust makes me ill.
8．(教材P32)To__prevent(prevent) it coming nearer, the government is planting trees.
9．(教材P32)Already the government has planted more than 30 billion trees and plans to__continue(continue) planting for the next five years.
