1. Plastic bags are very _______ to dissolve, so they will cause pollution. A. convenient B. difficult C. valuable D. simple 2. He is tired, ________he stayed up late watching TV. A. so B. because C. but D. and 3. We are talking about the preservation of ________resources. A. natural B. naturally C. nature D. naturalize 4. Is he really ________that you can’t come there? A. disappoint B. disappointed C. disappointing D. to disappointing 5. I suggest ________to the movies. A. go B. to go C. going D. went 6. They made their living by ________fish in the ocean every day. A. catch B. catching C. to catch D. caught 7. I think people should use tree leaves for _______ food. A. making B. rolling C. recycling D. wrapping 8. Nuclear power stations have caused much __________ pollution. A. environment B. environmentalist C. environmental D. environmentally 9. Unless you understand, I ________explain it again to you. A. am B. was C. will D. would 10. Because plastic bags are very hard to ________, they will cause pollution. A. dissolve B. wrap C. tear D. collect 11. These materials can be ________into other packaging products. A. reused B. reduced C. removed D. recycled 12. If people ________public transport, there will be less pollution. A. use B. will use C. can use D. used 13. Minh’s English is excellent. He speaks ________. A. perfectly English B. English perfectly C. in perfect English D. English perfect 14. I’ll be in trouble if I _________my passport. A. lose B. will lose C. lost D. would lose 15. I’m disappointed _________ people have spoiled this area. A that B. when C. if D. how 16. We couldn’t go on a picnic as planned __________ it was raining. A. however B. but C. because D. so 17. ________being tired, we sat down beside the stream. A. Because of B. If C. Because D. And 18. Don’t throw trash onto the water because the polluted water can directly ______harm to our health. A. make B. do C. reduce D. prevent 19. I’ll have to buy a map _________ I don’t know this area. A. if B. because C. when D. because of 20. the team has had a __________ start to the season. A. disappoint B. disappointment C. disappointed D. disappointing