题目内容：

    We have only one earth. It is the only environment for humans, animals and plants to live or grow in. However, we are polluting our earth every day. Good news is that the whole world has realized the serious problems and has taken action to fight against it.

World No Tobacco Day (May 31)

The first World No Tobacco Day is April 7, 1988. Since 1989, it was changed to be May 31st every year. The purpose of the World No Tobacco Day is to encourage people not to smoke.

World Water Day (March 22, 1993)

United Nations named 22 March as the first World Water Day in 1993. It’s a day to celebrate water. It’s a day to prepare for how we manage water in the future. It is celebrated around the world every year.

Earth Hour (2007)

Earth Hour started for the first time on March 31, 2007 in Sydney, Australia. Since then, the last Saturday of every March was named as Earth hour day that year. On March 19, 2016, more than 350 famous buildings in 178 countries around the world turned off the lights for one hour to remind people to save electrical power.

Actions in China to save our environment

Smoking is not allowed in all indoor public places from 2014. This is the first time for China to care about personal health in public places.

Ban(禁令) on free plastic bags. Since June 1, 2008, free plastic shopping bags are not allowed to provide in all supermarkets, shopping malls, and other places. It is to encourage people to use cloth bags or baskets for their shopping things.

Theme：The only environment for all the 1. things has serious problems, but the whole world has done 2. to prevent pollution.
Actions around the world	No Tobacco Day	Started on April 7, 1988, then changed to May 31st every year. Encourage people to 3. up smoking.
World 4. Day	Started on March 22nd 1993, celebrated around the world every year.
Earth Hour	Started for the 5. time on March 31st 2007, turned off lights for an hour to 6. electrical power.
Actions in 7.	Public places	Smoking is allowed in 8. public places to care about personal health.
Supermarket & Shopping malls	Encourage people to 9. cloth bags or baskets for shopping things. You need to 10. if you use plastic bags provided by the supermarket.