21.  "She must from the faculty of Literature! ''

22.  He must be fond of rock stars.

23.  Everyone is waiting for someone standing out and answering the question, since they all believe that there must be a "someone" who knows the answer will stand out just as they believe that "someone" can never be themselves.

24.  And my mother believed that those who wore special hairstyle and dressed "strangely" must be dangerous.

25.  They must depend on themselves to learn the actual ability in college.

26.  I had thought she must come from the south of Yangtze River.

27.  I must say I am much honored to be her friend.

28.  Since this stereotype damaged my GPA, I must get rid of it.

29.  Also, before forming a stereotype, I must think clearly if it is the same with reality.

30.  If so, I'll obey it; if not, I must throw it and form another scientific one.