Life is like a longrace ______ we compete with others to go beyond ourselves

In many people’s opinion,that company, though relatively small, is pleasant____.[ ]

Hurry up, ____________ you willmiss the early bus.

Three minutes later, more than ten policemen turned up at the spot　　　the accident happened.

Many wage earners in big cities find they may only have enough to ____ their houses, cars and other costs of living and have little extra money to invest.