$\text{@su}$

`21,` `C`

`=>` Dẫn chứng : "If you look down or to the side when the other person is talking, ... in what he or she is saying"

`22,` `B`

`=>` Dẫn chứng : Câu đầu tiên "In the United State and Canada, ... a conversation with him or her"

`23,` `A`

`=>` Dẫn chứng : Câu đầu tiên của đoạn 2

`24,` `D`

`=>` polite : lịch sự >< impolite : bất lịch sự

`25,` `A`

`=>` Dẫn chứng : Câu cuối cùng

$\text{@Bulletproof Boy Scout}$

`21.` `C` you are not interested in the conversation.

`-` Dẫn chứng: If you look down or to the side when the other person is talking, that person will think that you are not interested in what he or she is saying

`22.` `B` you should look him or her directly in the eyes.

`-` Dẫn chứng: In the United States and Canada, it is very important to look a person directly in the eyes when you are having a conversation with him or her.

`23.` `A` because they are thinking or finding the right word.

`-` Dẫn chứng: However, people who are speaking will sometimes look away for a few seconds when they are thinking or trying to find the right word.

`24.` `D` impolite

`-` impolite ( adj ) >< polite ( adj ): bất lịch sự  >< lịch sự

`25.` `A` The social "rules" are the same for everyone.

`-` Dẫn chứng: These socials "rules" are the same for two men, two women, a man, and a woman, or an adult and a child.