1. what makes the environment polluted ?
-> Water pollution , air pollution , trash and rubbish makes the environment polluted

2. What do you do with plastic bags , cans , bottles ?
-> I reuse them ( bạn dùng it cũng đc nha )
3. what do you do to keep the school yarrd clean ?
->I often collect the rubbish and put garbage bin around the yard .( bạn dùng trạng từ chỉ mức độ thế nào cũng đc nhé như : always ,usually , sometimes ,... )
4. how often do you ride a bike to school ?
-> I ride a bike to school every day 
5.what kind of transports do people use to reduce exhaust fume ?
-> people often use bike and some people use eletric bike to reduce exhaust fume .
chúc bạn học tốt nha có gì ko hiểu cứ hỏi lại nhé , xin tlhn ạ