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We must rescue endangered animal, because .....
We must don't drop litter, because.......
People must give up smoking, because......

We have to save the endangered animal, because if any species disappears, the animal feeding network may be disrupted. Many other animals will suffer because of this.

We should not throw garbage, because because of it our planet receives huge pollution, which carry heavy consequences.

People should stop smoking because it is harmful to their health and the health of those around them.