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15. They walk to work everyday.
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16. I’m going to buy 12 eggs
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17. he drinks lots of beer.
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18. the tree must be 10 meters high.
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21. they have lives there for 2 month.
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22. He will go there by the car.
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23. Mary’s going to buy 10 pens.
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24. Jill and Joe haven’t been to VN.
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26. He drove every fast.
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28. I observe  the flower vase .
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29. Her kindness makes me happy.
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