---Could I have a word with you, mum? ---Oh, dear, if you______.
Tom has been in the factory _________he left school.
He had _________ much work to do that he couldn't go out.
________the new computer, travellers at the offices of CAAC can now buy their air tickets much faster.
Before 1992, there was no airline _________ the two cities.
The food _______ my hometown is quite different ______that there.