题目内容：

In recent years,sandstorms1.(occur) in China frequently,especially in northwestern areas,2.severe influence has caused wide concern in China.

There're several reasons for this.First of all,people are cutting down trees without planting more,3.(make) some land become deserts.Another reason is4.it rains less due to the environment pollution.

To5.(efficient) prevent sandstorms,first,we should plant more trees and grass which can keep the soil 6. being washed away.Second,more green fences should7.(build) along the desert,8.it helps to control the process of the desertification.

Let's take action to do what we can9.(prevent) sandstorms from today.Soon the golden days we have been looking forward to10.(come).