At the sight of the scene of war, my _____ race back more than 50 years to the dark days of 1940.

The driver can adjust the heating in winter and the air conditioning in summer to suit his own _____.

H1N1 control and prevention is a   to China as well as the whole world． 

Mr. Chen drove all the ___ to Wuhan to attend the meeting.

In part of China, some people still have difficulty gaining        to social services.