China has ________ a number of satellites into the sky.

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As ________ as I know, he used to be a teacher when he was young.

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Can you ________ the difference between healthy plants and plants that are diseased.

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A．tell　　　　B．say

Because there is a lot of dust in the air, you can't ________ space clearly.

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My grandparents are content to ________ quietly in the country． 　　　

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A． live 　　　B． living 　　　C． alive 　　　D． lively

Many of the people didn't agree with him, but he still ________ his opinion．

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In English study, it's important for us to have a lot of ________．

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He said he could ________ and refused any help． 　　　

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He didn't want to go, but at last he ________ the invitation to the party ．

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John Smith ________ a deep natural tunnel(隧道) in the mountain． 　　　

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A． invented 　　　B． discovered 　　　C． uncovered 　　　D． finds