No one expected house prices to fall, but _____ that's exactly what happened.

Luckily, the man      escape death when a fire broke out in his home on Sunday morning.

. --- Believe it or not, I passed the driving test at the first attempt yesterday.--- Great! But remember you can never be ___ careful when driving a car in the street.

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

Work gets done __________ when people do it together and the rewards are higher too.