第一课时 Vocabulary 词汇
基础作业
一、写出单词的正确形式。
1-10 dried, valuable, drinkable, dropped, quantities, day, salty, stirred, under
二、用括号内单词或第一个字母完成句子。
1-10 drops, experiments, trip/travel, fresh, chemicals, continue,  through,  wastes, valuable,  returned
拓展作业
三、用正确的单词完成句子。
1-10 valuable, bite, formed, pocket, continue, towards, quantity, calories, bank, fresh
11-19 voice, experiments, dropped, salt, return, journey, pipe, change, add
第二课时 Reading 阅读
基础作业
一、单词意思匹配。
1-10 DJAIE   CHFGB
二、句子翻译，每空一词。
1.not to waste  , pollute    2. it's time to   3. was running  4. come home from work 5. add  salt to
拓展作业
三、阅读理解练习题
1.相关信息请参阅第三自然段。
2.Rain, sleet, snow or hail.
3.Water is probably the most precious resource on the Earth. We should try our best to protect it.
4.相关答案信息参阅第四自然段。
5.Chemicals,like cleaning supplies,paints and other toxins.
第三课时 grammar 语法
基础作业
一、单项选择题
1-10 DBADB   DBCDA   11-20 AADAD   ACCBB
二、选词填空。
1-9 too much, few, How much, enough, a few, a little, too many, How many, little
拓展作业
三、选词完成句子。
1-12 a lot of, much, a few, many, much, little  much, few, much, Most, a little, few, many
第四课时
基础作业
一、英汉互译。
1-10 take a shower, waste water, shut off the water pipe, instead of, use less water
用用过的水浇灌植物，充分利用，对…有大的影响，让水龙头开着，阻止某人倒..
二、根据中文意思完成句子。
1.it is to take instead of taking  2.leave the tap on
3.make full use of, watering flowers, used  4.to stop from pouring   5.make a big difference.
三、请根据图片，以“How to save water at home”为题，写一篇80词左右的文章。
How to save water at home
Water is very valuable. It's important for us to save water. But how to save water at home?
First, we should take a shower instead of a bath, because it uses less water.
Second, we should stop pouring waste water into rivers.Dirty water pollutes many rivers. And don't leave the tap on when we brush teeth. In this way we can save a lot ofwater.
Third, remember to water plants with used water. In this way, we can make full use of water.
拓展作业
四、句子翻译。
1.Water is made up of hydrogen and oxygen.
2.His pocket money is twice as much as mine.
3.I take a shower first instead of doing my homework when I come home.
4.We shouldn't waste our valuable time.
5.By the way,please remember to turn off the TV before you go to bed.
五、请以A drop of water为题，用第一人称口吻描述水从自然界到人类家庭再到自然界的过程，并呼吁节约用水，保护水资源。（80词左右）
A drop of water
Hi, everyone! I am a drop of water. I turn into the rain from a cloud,drip into rivers, and then I flow into reservoirs and am added to chemicals and am cleaned. At last, I enter your home through pipes. After being cleaned,I flow into the sea. Please save water, because every drop of water is valuable.
第五课时 跨学科延伸学习
基础作业
一、完形填空 1-10 DBACB   ABADC
二、阅读理解 1-5   ABCDA
拓展作业 略