I am worried about China’s car problems. More cars are now available, and     1     我们道路上的车子比以前更多了。There will be 140 million cars on our roads by the year 2020. That’s almost seven times the number of cars on our roads now. The increase in the number of new cars has already blocked roads.     2     Pollution is already a major problem and it will get much worse.     3     The sky is often a yellow-brown color in big cities. There are more road accidents in China than other countries.    4     Traffic problems and road accidents will get much worse in the future.

Cars can be very useful, but they also cause a lot of damage.     5    我认为人们在买车前有必要三思而后行。I also think more should be done about our country’s car problems.

“Thank you” is widely used in modern society. It is a very good manner     1     你应该说“谢谢” whenever others help you or say something kind to you. For example, when someone opens the door for you, you should say so. Also, it is polite to say “Thank you” when someone praises you.

“Excuse me” is another polite expression.     2     We use it the same as “Thank you”. When you hear someone say so behind you, it means that somebody wants to walk past you without touching you. It is not polite to interrupt (打断) others while they are talking.     3     If you want to have a word with one of them, please say “Excuse me” first. You should also do so when you want to cough or make any unpleasant noise before others.

In fact,     4     我们经常使用这两种礼貌表达 not only between friends, but also between parents and children, brothers and sisters, husbands and wives.     5     Let's learn to say “Thank you” and “Excuse me” in our daily life.

Human activities that have indirect effects on animals can be just as harmful.     1     当我们修建农场和工厂时, we destroy animal habitats and leave many animals with nowhere to live,     2     或者没有食物可吃.     3     We can also put animals in danger without ever entering their habitats. Air, water, noise and light pollution can all have a deep and damaging influence quite far from their source. Partly due to pollution caused by ship traffic and other human activities,     4     the dolphin population has dropped greatly. As the human population continues to grow,     5     so does the effect we have on animals.