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Although the world is hungry, it is even thirstier. While nearly 3/4 of the earth is covered with water, we are short of drinking water. Actually about 97% of the water on the earth  1. sea water.

2. can we deal with the problem of lacking drinking water? Firstly, we should save water instead of wasting it. Second, we should protect our water resources and not pollute 3.. Lastly, we should discover ways to reuse water. Scientists 4. got some achievements in this field. But people's need for water is increasing day by day. We still don't have enough water.

The sea seems to have the best answer. There is plenty 5. water in the sea. But we need to take the salt away from the sea water. This is very expensive. Many scientists can find cheaper ways to do it. Without doubt, we will solve the problem gradually.

九年级英语语法填空中等难度题

少年,再来一题如何?
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