1.  They have known what they want and what they have to do.

2.  However in fact I have never known about such kind of people, let alone their personalities.

3.  Diligent Students\

4.  You'd better know what you want exactly from your object and try your best to focus on it.

5.  My Ideal Girlfriend\

6.  From the definition of critical thinking, we have already known the significance of it.

7.  Secondly, you'd better know more about the person who you will communicate with, including their hobbies, their styles of talk and whether they like you to look into their eyes directly.

8.  In current society, people have known the importance of keeping good diet.

9.  We all have known that every coin has two sides.

10.  I've known that your research team is working at the Digital Michelangelo Project.