I have heard both teachers and students _______ ?

I have heard both teachers and students _______ ?

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Although they plant trees in this area every ?

Although they plant trees in this area every ?

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When people become unemployed, it is _____ ?

When people become unemployed, it is _____ ?

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I've never been to Beijing, but it's the place __?

I've never been to Beijing, but it's the place __?

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._______ his sister, Jack is quiet and does ?

._______ his sister, Jack is quiet and does ?

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