1. We have to take our own rubbish to the....... a. environment. b.garbage dump. c.refreshment. d.pollution 2. I think we should ......lazy students from throwing trash. a.prevent. b.reduce. c.persuade. d.save 3. If..... continues, there will be no forest left ten years from now. a. deforestation b. spraying pesticides c.air pollution. d.dynamite 4. Listen carefully to the conservationists teaching us......to protect the environment. a.how. b.what. c.why. d.when 5. Polluted water can.......do harm to people's health and kill fish. a.directly. b.effective. c.fast. d.immediately