

1.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.
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.