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-