АНГЛИЙСКИЙ ЯЗЫК!!! Помогите

Question

ИЗМЕНИТЕ ЧИСЛО СУЩЕСТВИТЕЛЬНЫХ НА МНОЖЕСТВЕННОЕ И ВНЕСИТЕ СООТВЕТСТВУЮЩИЕ ИЗМЕНЕНИЯ В ОСТАЛЬНЫЕ ЧЛЕНЫ ПРЕДЛОЖЕНИЙ:
1. We have built a gigantic factory.
2. The ox has hurt its hoof, and cannot draw the cart. 
3. The key to the box is lost.
4. The sheep is grazing in the meadow.

nadya_f_1 · Accepted Answer

ПРЕДЛОЖЕНИЙ: 1. We have built  gigantic factories. 2. The oxen have hurt their hooves, and cannot draw the carts. 3. The keys to the boxes  are  lost. 4. The sheep are grazing in the meadows.

ania_roza_12 · Answer

We have built a gigantic factor.
The oxen have hurt its hoofs, and cannot draw the cart.
The keys to the box are lost.
The sheeps are grazing in the meadow.
Вроде бы так, надеюсь, что правильно