Every possible means ______ to prevent the air pollution, but the sky is still not clear. 

 The number of people present at the meeting _______ two hundred and a number of them _______ from the countryside. 

The number of chairs in the room __ ten. I’m afraid a number of chairs in the room ___ lost.

It is said that 30% of the apples here _______ from abroad while 80% of the rice _____ grown here．   

---What ____ the population of China ? ---China has a population of 1.3 ____.