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Write the plurals of the following compund.
A. 1. brief case
2. alarm-clock
3. spinning whell
4. man-of-war
5. on-looker
6. wishbone
7. shut down
8. pro consul
9.horse race
10.out-stay
11. step son
12. pass word
13. take off
14. high way
15. handful
16. nick name
17. touch-me-not
18. hanger-on
19. court martial
20. maid-of-honor