school's dining room is very large和She gave me a birthday present为什么school是school's而birthday不用birthday's,

Our school dining room is very large我可以把这句话写成Our school's dining room is very large吗?为什么? The dining room is behind our school science lab.next to the library.[ ]A.It's B.they are C.The dining room D.its school's dining room is very large和She gave me a birthday present为什么school是school's而birthday不用birthday's, dining-room和dining room哪一个正确 DINING ROOM怎么样 dining room怎么读 dining-room的意思 DINING ROOM怎么样 dining room怎么读 dining room的意思? dining room怎样造句 dining room的英文是什么 dining room是什么意思?谢谢啦! long dining room的意思 dining room怎么造句快点 my dining room的作文 为什么dining room 不双写n 是dinning room还是dining room?