Nối hai câu sau thành một câu sử dụng mệnh đề quan hệ

 Nối hai câu sau thành một câu sử dụng mệnh đề quan hệ
1.Mary is my best friend. She lives next door.
2.The man is my neighbor. He owns a dog.
3.The dress is very beautiful. I bought it yesterday.
4.The book is interesting. It is about history.
5.The teacher is strict. She gives a lot of homework.