用所给词的适当形式填空
I’m  sorry  to  have  kept you        (wait) for so Long.
  --- Do you hear someone        (knock) at the door?
--- Yes, l did. I heard him        (knock) three times.
  When you speak English, be sure to make yourself        (understand) .
  People who won’t work should        (make) work That’s my idea of how we should help such people.
One of the glasses was found        (break).
  The party calls on us       (serve) the people heart and soul.
  I don’t remember him ever        (say) anything like that.
  We had the photos        (take) while we are working in the field. I do hope you will like them.
  When the parents got to the place, they found the boy        (lie) on the ground.
  After so many years, we were not surprised to find’ the place much
      (change).