1. (2019八下·宝山期末) 根据你所听到的短文内容，完成下列句子，每空格限填一词。

The world is not hungry, but it is thirsty.<br />It seems strange that nearly three fourths of the earth is covered with water while we<br />say we are short of water.<br />Why?<br />Because about 97% of water on the earth is seawater which we can drink or use for watering<br />plants directly.<br />Men can only drink and use the 3% of the water that comes from rivers and lakes.<br />And we can't even use all of that, because some of it has been polluted.<br />Now more water is needed.<br />The problem is, can we avoid a serious water shortage later on?<br />Firstly, we should all learn how to save water.<br />Secondly, we should find out the ways to reuse it.<br />Scientists have always been making study in this field.<br />But even if every large city reused its water, still there would not be enough.<br />What could people turn to next?<br />The sea seems to have the best answer.<br />There is a lot of water in the sea.<br />All that needs to be done is to get the salt out of the seawater.<br />So you see, if we can find a way out, we'll be in no danger of drying up.<br />The world is not hungry, but it is thirsty.<br />It seems strange that nearly three fourths of the earth is covered with water while we<br />say we are short of water.<br />Why?<br />Because about 97% of water on the earth is seawater which we can drink or use for watering<br />plants directly.<br />Man can only drink and use the 3% of the water that comes from rivers and lakes.<br />And we can't even use all of that, because some of it has been polluted.<br />Now more water is needed.<br />The problem is, can we avoid a serious water shortage later on?<br />Firstly, we should all learn how to save water.<br />Secondly, we should find out the ways to reuse it.<br />Scientists have always been making study in this field.<br />But even if every large city reused its water, still there would not be enough.<br />What could people turn to next?<br />The sea seems to have the best answer.<br />There is a lot of water in the sea.<br />All that needs to be done is to get the salt out of the seawater.<br />So you see, if we can find a way out, we'll be in no danger of drying up.

1. （1） It seems strange that we say we are   water.
3. （2） Man can only drink and use the water that comes from and .
5. （3） We should all learn how to   .
7. （4） If we can find a way out, we'll be in   of drying up.