What is learned in books cannot have the same deep ________ on a child's character as what is learned through experience.

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The ________ of nearly 3,000 lives in the September 11 th attack was a great disaster.

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Dark glasses are sometimes worn to ________ the eyes from strong sunlight.

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The poor in the mountainous areas in China always ________ the exact cost of their daily life.

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The Internet is a computer ________ that uses the telephone system to link together millions of computers around the world.

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It is possible for you to use the word ________ when you are trying to give your own opinion.

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The young couples looked unhappy. How did this quarrel ________?

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During the Industrial ________, things changed. Farmers left their fields and went on to work in factories.

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If there is no difference in general ________ between boys and girls, what can explain girls' poor performance in science and mathematics?

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Inspired by his scientific curiosity （好奇心）, Alexander Graham Bell, inventor of the telephone, went on to ________ other new inventions, including the photo phone in 1880.

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