He experimented ________rats.

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I was interested _________in the paper that scientists had found out how to talk to whales.

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Because the shop ________, all the T-shirts are sold at half price.

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In a test paper, anything wrong ________ the teacher.

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The war ________ in 1937.

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He arrived in London, where he ________ his friend.

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Professor White has written some short stories, but he is ________, known for his plays.

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He is ________ our teacher. He is also our best friend.

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After the emperor' s death, he ________.

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We were ________ to respect the old.

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