When the holidays came , some problems were happening . Two of the biggest are heavy traffic and pollution .
In the cities . There are many cars and bikes . So that cause heavy traffic and pollution . On the road . When you are riding a bike , think about the risk of an accident .
There are some advise . Obey the traffic rules , when the lights were chancing to green , you can go . Don't ride so fast , when it was raining . In the home , keep clear of fairs . Don't play in the kitchen . After you watch TV , you should turn off the TV .
本文来源：https://www.010zaixian.com/zuowen/shijianleiyingyuzuowen/13401.htm