‘돌봐야 할 많은 애완동물이 있었다’ 영작 질문이에요

“그 집에는 돌봐야 할 많은 애완동물이 있었다”를 영어로 어떻게 쓰면 좋을까요?
제가 생각한 문장은 다음과 같아요.
1. There were many pets to take care of in the house.
2. There were many pets to be taken care of in the house.
3. There were many pets (which were) taken care of in the house.
4. There were many pets (which are) taken care of in the house.
5. There were many pets for me/us to take care of in the house.
이 중 문법적으로 어색하거나 틀린 문장이 있는지 궁금해요.
다른 자연스러운 표현도 있다면 설명과 함께 알려주세요.