Plural Forms and Irregular Nouns

What is the correct PLURAL of the word?
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1. How many personpeople study English as a second language?
2. Five womanwomen opened a computer services company.
3. Even childchildren enjoy learning on the Internet.
4. Most basketball players are 6 footfeet tall or more.
5. Which breed of sheepsheep produces the finest wool?
6. My toothteeth are sensitive to the cold.
7. At daylight savings time, we have to change our watchwatches .
8. The boys went fishing and caught 10 fishfish .
9. There are 10 manmen in the Maintenance Department.
10. The wifewives keep their knifeknives on the shelfshelves.