A：Look! That stamp __1__ eight dollars.

B：Do you mean the big one ___2___ Canada with the bear on it?

A：Yes. It’s big, ___3___ it? But the colours aren’t very bright.

B：The one ___4___ the carrot on it is more colourful. It’s got red, blue, orange, green and brown.

A：The one with a dragon ___5___ it is more beautiful, however.

B：___6___ one? The Canadian one that costs 46 cents?

A：No, the other one.

B：Oh, I see it. It costs three dollars and ten ___7___. There ____8___ two nice old stamps from China below it, too. The one on the left shows a Young Pioneer. It’s only blue and red but it’s interesting.

A：The other one is nice, too. What does it cost?

B：Eight fen, ___9___ is eight cents in Chinese ___10___.

1.The Internet makes our life nicer, __________(容易的) and more colourful than before.

2.A high-speed railway ___________(在….之间) Beijing and Shanghai will be in use soon.

3. －Sue，what did you do last Sunday?

－I __________(买) a birthday present for my Dad.

4. Nancy, I can’t understand the meaning of this word.

－Please look it up in your ___________(字典).

5. －Would you please ____________(邮寄) the letter for me?

－With pleasure.

　　Yellow, orange, red and green- tree leaves make autumn a colourful time! Who paints all these colours? It is the leaves themselves. Inside a leaf, there are millions of little colour“bags”, they are green, yellow and orange. The green ones are called chlorophyll（叶绿素）.The yellow ones are called xanthophylls（叶黄素）. The orange ones are called carotene（胡萝卜素）.

　　In summer, the green chlorophyll is very, very busy. It makes food for the trees. It catches sunlight to change water and carbon dioxide（二氧化碳）into sugar. This sugar is the food for ther tree. It is so busy that it covers up all of the other colours in the leaf.

　　When the weather grows colder in autumn, there is less light and water for trees. The trees will have a rest to get ready for winter. They've made enough food in summer! The leaves no longer need water to make food. Without the water, the green chlorophyll starts to go away. The other colours in the leaf-the yellow xanthophylls and orange carotene come out. So the leaves don't really“turn”a certain colour. They just lose their green !

　　The leaves look red or purple because they have some sugar in them. They“steal”some food from the tree! The green leaves are from the evergreen trees （常绿树）. The evergreen trees stay green all year long. Their leaves don't lose water in winter.

(1) The tree leaves have the following colour“bags”, such as green, yellow and orange except red.

(2) In summer, the green chlorophyll works hard for the tree leaves.

(3) In autumn, the tree leaves turn yellow or orange because the green chlorophyll stops working and goes away.

(4) Tree leaves no longer make food in summer.

(5) We can infer（推断）from the article that trees can clean the air.