5.By the time I arrived at the party, everyone else had already showed up.
当我到达晚会时，其他的每个人都已经到了。
6.When he put the noodles into the bowl, he realized he had forgotten to add the green beans. 当他把面条放进碗里时，他意识到他忘了添加绿豆荚了。
7.Before she got a chance to say goodbye, he had gone into the building.
在她得到一个向他告别的机会之前，他已经进入楼房了。
Unit13 We're trying to save the earth！
【重点短语】
1. at the bottom of the river 在河床底部
2. be full of the rubbish 充满了垃圾
3. throw litter into the river 把垃圾扔入河中
4. play a part in cleaning it up 尽一份力把它清理干净
5. land pollution 土地污染
6. fill the air with black smoke 使空气中充满了黑烟
7. cut down air pollution 减少空气污染
8. make a difference 产生影响
17. take action 采取行动
18. turn off 关掉
19. pay for 付费
20. add up 累加
21. use public transportation 使用公共交通
22. recycle books and paper 回收书和废纸
23. use paper napkins 使用纸巾
24. turn off the shower 关掉喷头
25. ride in cars 开车出行
【重点句型】
1.Even the bottom of the river was full of rubbish.
即使河底都充满垃圾。
2.Everyone in town should play a part in cleaning it up.
城里的每个人都应当尽一份力把它清理干净。
3.The air is badly polluted because there are too many cars on the road these days.
空气被严重污染因为如今路上的汽车太多了。
4.To cut down air pollution, we should take the bus or subway instead of driving.
为了减少空气污染，我们应当乘坐公汽或地铁而不是开车。
5. I used to be able to see stars in the sky.
我过去能在天空中看到星星。
6. The air has become really polluted around here. I’m getting very worried.
这儿的空气真的已经被污染了，我非常担心。
7. No scientific studies have shown that shark fins are good for health.
没有科学研究说明鱼鳍对人们的健康有好处。