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waste water
the earth, the sun ,the moon这三个表示天体的名词前都要用定冠词the。earth的发音是以元音因素开头的，其前面所用的定冠词读/ei/。
drive
the earth
cut down trees
waste water
pick flowers
drive a car
make the air dirty
dirty
show time!
What’s missing?
We shouldn’t
We should
Learn English.
pick flowers.
cut down trees.
make the air dirty.
waste water.
play sports.
eat healthy food .
help the animals.
I can do it!
You can do it!
We can do it!
Homework
1.Copy new words we learned in
this class.(抄写本课所学新单词）
2.Preview the dialogue. （预习对话）
3. Do one good thing for our earth