—How did the fire_____?--By a car accident.

Please ______the money and I’m sure it will ______more than 1,000 yuan.

Studies show that people are more        to suffer from back problems if they always sit before computer screens for long hours．

You’d better        fatty food if you want to stay slim．

The government ______ air quality in urban areas from levels one to five: excellent, fairly good, slightly polluted, poor and dangerous.