It's easy to take care of?这句话错吗?

It's easy to take care of?这句话错吗? It's not an easy job to take care of so many children. 为什么It's easy to take care of中有of而It's easy to take part中没有in I treat the dog as my pet .It's easy ___ 答案说是to take care of Fish are easy to take care of it is easy to take care of为什么后面没有it 英语翻译this pet is unusual.it is easy to take care of and it ta This pet is unusual.It is easy to take care of and it takes. this pet is unusual.it is easy to take care of and it talks. It is easy to take care （of）要不要加上of呀 It is easy to take care of a tortoise.（改为同义句） I think the dog is easy _.A.to take care of it B.to take car