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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He got seriously ill at the age of five. Later he couldn't see anything at all. He was' ________ blind.

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-- Can you solve the problem by yourself?

-- I think I can ________ it.

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Don't be, too strict（严历）with John. ________, he is still a child.

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It seems that the young man and the lady have little ________.

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Correct decision depends on enough ________.

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