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John is tall.
David is than John.
Dick is the.
A. But we shouldn't waste water like this.
B. We shouldn't wash clothes in the river.
C. We must save every drop of water.
D. What are you going to do, Mum?
E. Everyone needs water.
A:
B: I'm going to wash clothes in the river.
A: We should keep the rivers clean.
B: OK! I wash clothes at home.
B: Why?
A: We need water.
B: I'm sorry.
A: There isn't enough water on the earth.
B: I see. You are a good boy!
We should get up early every day.
We shouldn't eat too much meat.
You shouldn't play computer games too often.
We should help our parents.
You should study hard in class.
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