Выбрать нужную форму множественного числа имени существительного:
(Ox) and (deer) are animals.
I have two ( sister).
Put your (money) in the pocket.
You must keep your ( tooth) clear.
(Tree) are in red and yellow.

Oxen and deer are animals.I have two sisters.Put your money in the pocket.You must keep your teeth clear.Trees are in red and yellow.