You can change your job，you can move house，but friendship is meant to be________life(2012·安徽，25)

I can find a better job if Igo to Germany, maybe— Don’t be silly ________, you know

Lei Feng for many years, but his spirit is still encouraging us.

In fact, her persistance(坚持) is one of the ____ why Tu Youyou won the Nobel Prize.

So, it was a win-win situation _______was why we did not hesitate _______ with them.