Choose the correct plural form.

1. Tooth -

a) tooths b) teeth c) toothes

2. Leaf -

a) leaves b) leafes c) leafs

3. Knife -

a) knifes b) knives c) knifs

4. Sheep -

a) sheeps b) sheepes c) sheep

5. Mouse -

a) mice b) mouses c) mices

6. Baby -

a) babis b) babys c) babies