Listen, Robert, going to another country doesn't make any ________.

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Age and experience gave him a(n) ________ over John.

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He has been seriously ill, but he is now ________.

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Many plants and animals on the earth have ________, and some other species are endangered.

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－The cars give off a great deal of waste gas into streets.

－Yes. But I'm sure something will be done to ________ air pollution.

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Yesterday the teacher asked a very difficult question, and none of us ________ a right answer.

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It's up to you to decide whether to ________ physics or chemistry.

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Here is my card. Let's keep in ________.

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I don't think I'll need any money but I'll bring some ________.

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Each of our English class begins with ________ talk.

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