____is certain is ___prevention is more important than treatment .

 Choosing a college major can be a difficult task, but it is nothing to take         .

It’s the ability to do the job _______ matters not where you come from or what you are.

Young men should constantly _________their own state of mind so as to adapt to the circumstances in which fierce competition is going on .

  _____ , you need to give all you have and try your best.