Time, ________ correctly, is money in the bank.

Cleaning women in big cities get               by the hour. 

        with the size of the whole earth , the biggest ocean does not seem big at all .

Taobao.com has begun selling tickets online for international flights, ______ to cut the market share of Ctrip.com and other competitors.

His new novel is ________his own experience when he was studying in Harvard University.