Вставьте недостающие местоимения: school is big. this is hob, the dog, and that is . the doghouse is big and brown. roof is green. is by the pond.

Our school (первое предложение не совсем понятно, нет контекста, можно поставить и my и his и her. Далее по контексту)
its doghouse
its roof
it is by the