I didn't know Jack's address ________ he wrote to me.

A.because B.when C.until

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We know China is an eastern country and France is a _______ country.

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Teeth are very important for our health. They will be our lifelong friends. So we should learn to protect them at a very young age. Here are some tips:

First, we should eat right.

*Don't eat too much candy or drink too much cola, or our teeth will go bad easily.

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*Eat more vegetables and fruits to help teeth clean.

Second, we should keep these numbers in mind.

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1.We're too young, so we needn't start protecting our teeth.

2.Cheese, milk and yogurt can keep our teeth strong.

3.We shouldn't brush our teeth before bedtime.

4.We can brush our teeth for only one minute each time.

5.At least four toothbrushes should be used in a year.

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I can only have ________ food because I'm ________ late.

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Working hard makes ________ possible for us to pass the final examination.

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Most people will think about erasers only when they need to change something on their paper. In fact, erasers have a long history.

The history of the eraser began in the 1700s. There were lots of rubber trees (橡膠樹) in South America. People got rubber from the trees and made many things with it. A man from France visiting South America saw this material (材料). He thought it was special and useful. So he sent some to his friends in Europe to study. Some went to a man in England. His name was Edward Nairne.

One day, Edward was writing on his table and needed an eraser. But he didn't use a piece of bread, a popular eraser at that time. Instead, he used a piece of rubber that was on his table. To his surprise, it worked better than bread. That was when Edward had an idea. Soon, he started to make rubber erasers and sell them.

How does the eraser work? When you write on paper, small pieces of graphite stick (粘貼) to paper. Graphite is the black material inside pencils. When you move an eraser on paper, it becomes warm. When it's warm, graphite sticks to it and words come off the paper.

1.What can we know about the eraser we use now?

A.A French man brought it to other countries.

B.It has a history of about three hundred years.

C.People in South America first started to use it.

2.The underlined word "it" in paragraph 2 refers to ______.

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A.To make rubber erasers and sell them.

B.To learn how to plant rubber trees.

C.To write articles on his table.

4.What is Paragraph 4 mainly about?

A.How the eraser works.

B.How to get rubber.

C.How to use an eraser.

5.Which can be the best title for the passage?

A.Erasers Around the World

B.Erasers in Different Times

C.The History of the Eraser

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