The children are giving their classroom a good cleaning, ___ are sweeping; ___ are mopping. 

 The old man had expected to see all his children when in hospital, but _____ came to see him.

Mum disliked ______ when I behaved badly in front of the guests.

I will never know what was on his mind at the time, nor will ________.

Until he told me yesterday,I knew______of what had happened to him .