_____ the population of China? — About 13 billion

It’s ____ unusual chance for Mr White to get such ______ useful advice.

One day， _____，Newton saw an apple fall from a tree

Will you go to the World Expo in Shanghai by bullet train after theExamination—_______ I may go by air

How did you do in the test yesterday—–Not so well I ______ much better but I misreadthe directions for writing