What does this sign mean?

 

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I always ______ my homework before dinner.

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Sammy studied really hard, so she ______ all of her tests.

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I don’t like mathematics ______ it’s difficult.

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We ______ submit our geography essays to Mr. Kim this Thursday.

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Max ______ his school project on time yesterday.

Find the mistake in the following sentence.

He have to wear his uniform to school.

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The teacher asked us to choose a book from the list, read it at home and then write a ______ about it.