Reduce clauses by using present participle or past participle

V. Reduce clauses by using present participle or past participle.
3. The people that exercised every day lost the most weight.
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4. There were many employees who were working very hard.
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5. The new illness, which was discovered by a doctor in Nigeria, has not yet been named.
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6. The silk, which is imported from Thailand, is worth a lot.
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7. The students that have studied the hardest have the best results 
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8. The man who works at Costco lives in Seattle.
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9. Who is that man who is waving at us?
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10. The student who is chosen as winner will get a prize.
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