59.完成关于环保的报告finish writing his report on environmental protection

58.建议某人不要做某事advise sb not to do

57.尽可能多地列出理由

　list as many reasons as possible

56.发表你的观点 give your opinion

55.为你的论点辩护 defend your argument

54.准备好回答问题

　be ready to answer questions

53.挣钱 make money

52.步行骑自行车和合伙用车

walking, biking and car-pooling

51.我们要行动 we need action

50.利用可选择性的交通

　make use of alternative transportation