Water is very important to us. We can't live without it. There is (lots of, some) water on Earth, but we can't use (too much/too little). About 97% of the Earth's water is salty. We can use only about 1% of the Earth's water. It's (too few/too little). We use water from both lakes and rivers. (Some/Any) of the water evaporates and then becomes rain. Sometimes the Earth's water is in the wrong place. There is (plenty of/little) rain in the tropics (热带地区), but it is difficult to have farms there. (Some/Many) desert land is rich/but there is only (a little/a few) water in the desert. The water is necessary for us (live) and it is very (value). We must save water because we can use (too much/too little) Earth's water.
