Pluralul substantivelor

Gap-fill exercise

Fill in all the gaps, then press "[?]" button to get a clue.
II. Treceți următoarele substnative compuse la numărul plural:
schoolboy;
masterpiece;
brother-in-law;
father-in-law;
headmaster;
milkman;
woman
dentist;
postman;
blackboard;
son-in-law;
passer-by;
bedroom;
car race;
looker-on;
man singer;
merry-go-round;
horse-race;
forget-me-not
footstep
fireman.