Can you rewrite the following sentences in correct English?

V. Can you rewrite the following sentences in correct English?  
1. Laughing is not good with health.
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2. Some people have a very bad habit in littering in public.
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3. People who live in a dusty area often suffer on diseases.
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4. In prevent flu, we should keep our hands clean, out feet warm.
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5. She has a sore throat yesterday.
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Help me pls