昨天他亲眼目睹了一起交通事故。

A．You should expect better results.
B．Oh, it was terrible to have a fire in a chemical works.
C．Chemistry is always more difficult than physics and Chinese.
D．What a pity because you are working very hard these days.

A．Show the importance of the sun.
B．Criticize the man’s waste of oil.
C．Stress that oil is getting more important.
D．Make the woman feel better.