一、根据句意，从方框中选择适当的词并用其正确形式填空。
step litter knock cover six
1. Who is on the door?
2. The water about 71% of the earth's surface.
3. The blackboard says, "No in the classroom."
4. The lake is meters deep.
5. We can save the water in the following .

一、1. knocking 2. covers 3. littering
4. sixty/six/sixteen 5. steps

二、选出正确答案并填在横线上。
1. a shower as quickly as possible.
2. litter in the river.
3. No in deep lakes or rivers.
4. Let's the river clean together.
5. Never too much water in your daily life.

二、1. Take 2. Don't
3. swimming 4. keep 5. use

三、按要求完成句子。
1. Put the poster on the desk. the poster on the desk.
2. There are over 24,800 lakes in China. are there in China?
3. We can't swim in a deep river. in a deep river.
4. We should turn off the tap while brushing our teeth. the tap while brushing your teeth.
5. The river is about 2,638,570 meters long. .

三、1. Don't put 2. How many lakes
3. Don't swim/No swimming 4. Turn off
5. two million, six hundred and thirty-
eight thousand, five hundred and
seventy

一、根据中文意思完成句子。
1. 让我们在网上搜寻一些节约用水的好方法。
Let's some good ways to save water on the internet.
2. 我们可以收集雨水浇灌植物。
We can to water the plants.
3. 我们需要为世界水日制作一张海报。
We need to for World Water Day.
4. 你知道如何重复利用水吗？
Do you know ?
5. 请你浇完花后关掉水龙头。
Please the tap after you water the flowers.

1. search/look for
2. collect rainwater
3. make a poster
4. how to reuse water
5. turn off