<span>is an opening to a story that establishes the context and gives background details, often some earlier story that ties into the main one, and other miscellaneous information. so it would be "to set the mood and tone of the play and provide background information"</span>
Because they make you seem confident
Cao Xueqin was the author
the strength to do without anything,to live simply,and have the desire of making themselves worthy of giving.