The bank refused to give the company more time, and ________, it broke down.

—Did you have any trouble in getting here ?— No .       I would have telephoned you .

— Lovely weather, isn’t it?— Yes, a bit hot, ______ ．

--- Credit cards are       useful when travelling.—True. They save us the trouble of taking too much cash.

It is the prevention of disease______its successful treatment that has led to the rapid increase of the world’s population.