补全对话，每空一词。
A: What bad weather! The wind is blowing 1 with lots of sand. You'd better not go out now.
B: But there's 2 wrong with my computer. I want to ask Uncle Lin to mend it. Wow, what a
strong sand storm! How 3 will it last?
A: Maybe half a day.
B: Do you know what causes these sandstorms?
A: People have cut down too many trees. But trees can prevent the sand from moving toward the rich
land and they can also keep water from 4 the earth away.
B: So what can we do to stop the sandstorms?
A: We can 5 more trees and protect our environment.
B: I agree with you.