根据上下文及中文提示填写单词。

     Daming and Tony are classmates.  Tony has already made a __1__ (模型) of the space station.  This is

  for his space travel  homework, but Daming hasn't __2__ (完成) it __3_ .  Tony asks Daming not

__4__  (惊慌) __5__ (因为) their teacher Ms James wants it next week.  They have known the

 __6__ (最新的) news.  Some scientists have__7__ (发射) a spacecraft to Mars.  It has taken

 __8__ (少数,几个) months to get to Mars.  There aren' t __9__ (一些) astronauts in the spacecraft.  

 What a pity! Maybe it's an unforgettable__10__ (经验).