Write the plurals of the following compound nouns.

1. Brief case-

2. Alarm-clock-

3. Spinning wheel-

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-.