. If/ people/ plant/ more trees,/ they/ save/ environment. 2. If/ environment/ green/ clean,/ human life/ better. 3. If/ we/ use/ more/ motorbike / car,/ air pollution/ rise. 4. If/ air pollution/ not decrease,/ people/ get/ some/ breathing problems. 5. If/ there/ not/ rubbish bin/ in each classroom,/ it/ not/ cleaner.

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