Paper was improved by a Chinese man called Cai Lun in 105 AD. In the 1lth century, China began to use paper money. 【小题1】. At that time, people made paper from the wood of a special kind of tree.

【小题2】. And more and more paper is used. You know, 17 trees are needed to make one ton of paper. And it takes more than 10 years for a tree to grow. It is clear that there will be fewer and fewer trees left on Earth soon. Therefore, 【小题3】.

Now we know it is important not to waste paper. 【小题4】 First, we can use both sides of every piece of paper. Second, we can put drinks in bottles instead of paper boxes.   【小题5】. We can also use handkerchiefs instead of tissues. Last, we can reuse envelopes (信封). We can use fewer paper shopping bags by reusing them as well.

A small talk with others doesn't have to be painful, even if it's with your boss. Believe it or not, it can be fun. A small talk with others is also an art and you can learn a lot from it.

Here's how to enjoy making a small talk.

1. Understand current events(时事). Make a small talk about news, sports, weather, or politics. Of course, politics will not make all men happy.

2.Make a talk about a piece of clothing. Ask where it comes from or other questions

3.Share an anecdote about your day. Did you lose your keys or find $10? Maybe you ate at a new restaurant recently, or found a great new CD. When you make a small talk, you will share the little things in life with others.

4.Ask what movies or books they’ve seen or read recently. Someone once asked me that a party. And we had a good conversation about the book I was reading

5.Talk about TV. Share your favourite TV shows- they are interesting to discuss! Make a small talk about pop culture. It is easy and fun.

6.Recall your past conversations with the same person. Ask if his son is still ill or how the holiday went. A small talk with others is easier when your memory is good.

7.Relax. Enjoy yourself.

If you use these tips for making a small talk, you'll be relaxed.

Diana was born in a rich family on July 1st, 1961. On July 29, 1981, Diana married Prince Charles. Later she gave birth to Prince William and Prince Harry.

Dianna enjoyed taking part in international Charities(国际的慈善机构) One day in July 1991, she went to a hospital to see AIDS patients with Barbara Bush, the wife of the president of the United States at the time. Princess Diana talked with an AIDS patient who was unable to stand up. She even hugged(拥抱) him and encouraged him to fight against the illness(疾病).The patient was very grateful and said, "AIDS patients do need warm hugs. " Of course, she made it. Unfortunately, she died in August 1997. British Prime Minister, Tony Blair said in his speech that Diana was the People's Princess.

After her death, people set up a fund(基金)to remember Diana and help those who need help in the UK and around the world.