The space station spins slowly in ________ space to imitate _______

The space station spins slowly in ________ space to imitate ________ pull of the earth’s gravity.

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the; /

/; the

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There is _______ useful book on the desk.

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the

 Wouldn't it be ________ wonderful world if all nations live in________ peace with one another?

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a; /

the; /

a; the

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Catching________ sight of a policeman coming here, the thief hurried out of________ sight.

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the ; the

Young as he is, David has gained ___________ rich experience in ___________ society.

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a; 不填

不填; 不填

不填; the

--What’s ___ population of China? --China has ____ population of 1.5 billion.

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a; the

the; a

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