Help me:
a.The dirt on vegetables can cause you sick
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b.Long is worried because he has see the dentist
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a.The dirt on vegetables can cause you sick
=>You can be sick because of the dirt on vegetables.
b.Long is worried because he has see the dentist
=>Because Long has to see the dentist,he's worried.
You can be sick because of the dirt on vegetables
Because Long has to see the dentist , he is worried