My headache______.I thought it was going away,but now it was getting worse and worse.

When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the world.

You type almost anything into the space provided on Baidu and in a second it _____with thousands of references.

The bill would ______ workers twelve weeks of unpaid leave for family emergencies.

It is really a pity that as many as 58 lives didn’t ______ the big high-rise fire that happened in Shanghai on 15th.November,2010.