. The boy was sitting at the desk, ______ hard when his mother got home.
________,he never seems able to do the work beautifully.
________ they heard the shout for help,they rushed out.
You should make it a rule to leave things ________you can find them again.
This is the best book _____ I have been looking for all this year.
Lucy has a great sense of humour and always keeps her colleagues _____ with her stories.