Dùng đại từ quan hệ viết lại những câu sau 21. December is a month. It is the coldest in the USA in this month -> 22. The days were the saddest ones. I lived for from home on those days -> 23.Do you know the hotel? John is staying in that hotel -> 24.The day is so boring to me.We don't meet each other on that day -> 26.You didn't come to my party. Tell me the reason -> 27.I don't know the reason. she left the school for it -> 28.The talk is about 350 words.You must describe the all essay -> 29. I have always admired her paitings.I bought all of them -> 30.she's very generous woman.She is always ready to help others -> làm gấp hộ em với ạ