题目内容：

根据中文提示，用词组的适当形式填空。每空一词。（每小题1分，共5分）

1.Trees can  ___________ the sand __________ (阻止)  moving toward the rich land. 

2.___________ __________ (多亏) the Great Green Wall, the land produces more crops.

3.My sister is always ___________ __________ (缺乏) money at the end of every month. 

4.We often                    (挨饿)because the boss didn’t give us enough food to eat. 

5.Many animals are  ___________ __________ (灭绝；绝迹) because of all kinds of pollution.