What does "the grammar of any culture" refer to in the first

What does "the grammar of any culture" refer to in the first paragraph?_________

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I am heartily grateful to your help.

I am heartily grateful to your help.A.helpful B.hateful C.delightful D.thankful

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Independent language learners rely on themselves __________.

Independent language learners rely on themselves __________.

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When a liquid boils, it becomes a gas.

When a liquid boils, it becomes a gas. A.A vapor B.B danger C.C fuel D.D bubble

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The improvements the airlines attempt at include all the fol

The improvements the airlines attempt at include all the following EXCEPT_______

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