_______ on rescuing her sick son, the poor mother has been working 16 hours a day.
They looked at each other, ______.
Mr. Smith, _______ of the ______ speech, started to read a novel.
Look, what a dirty classroom we have got! It really wants ______.
It is high time, I think, that you got down to ______ something in class.
I've never seen a Shakespeare's play ______ so wonderfully.