—Under no circumstances ________ the door to the Data Centre unlocked.—I promise I'll be more careful in future.
The thought ______ he might fail in the exam worried him a lot.
The noise was so ______ that he was so ______ that he stayed awake the whole night.
It suddenly ______ to me that we could use a computer to do the job.
______ is known to us all that the 2012 Olympic Games will take place in London.
--Sorry, I’m late. The bus got hold up in traffic. --_____________.