题目内容：

阅读下面短文，根据短文内容，从方框内所给的选项中选出能填入空白处的最佳选项，使短文意思通顺。选项中有一项为多余项。

The words “you know” is not a new form of slang(俚语). It has a long history and has many uses in popular culture. The situation tells you which of these words “you know” serves.

If someone says, “How about a little something? You know, for the effort, you know.” 1.When he says “you know” before and after the words “for the effort”， he wants you to know he has worked hard. He uses “you know” to make a request. He wants to improve his chances of getting the payment. In fact, it means “Can you give me a tip for helping you？”2. If a girl says，“My parents died in a car accident four weeks ago. It was terrible.” “You know, we didn't have the time to get to know one another. 3.” Here, the second speaker begins her sentence with “you know” to get the trust of the girl. She begins with “you know” so that it gives the girl the idea that they have a connection. She mainly wants to make her words sound familiar.4. Imagine two people are staying late at work. One person might tell the other person they need to go. She might say, “Hey, Jane, you know, the last train leaves in 15 minutes！”5. Jane probably doesn't know that the train is leaving soon. But her workmate wants to use language to show she does know the fact.

A．But such a direct question seems to be impolite in American culture.

B．That is how to use “You know”.

C．Here the speaker is offering information about the train.

D．He's asking for a small payment.

E．But I want you to know I won't let down a child.

F．She also wants to improve her chances of a positive(积极的) reply from the young girl.