Vote cho 5 sao nè 1. Environmental pollution has ___ to lots of health problems. * a)led b)made c)caused d)resulted 2. ___ industrial waste, many fish cannot survive. * a)Because of b)As c)Because d)Since 3. To protect the environment, we should use more ___ sources of energy such as wind and solar power. * a)renewable b)reused c)reproduced d)recycled 4. According to scientists, exhaust fumes are ___ our hometown. * a)measuring b)radiating c)treating d)poisoning