阅读短文，根据其内容简要回答问题。
During the Second World War it was very difficult for ordinary people to travel by plane because the
seats were needed for important government people and high rank (等级) officers in the army.
Mr. Brown worked for the government during the war. He acted as an ordinary cook but in fact he was
doing important secret work, and nobody was allowed to know how important he was except for a few very
top people.
One day Mr. Brown had to fly to London to give a report to some important people in the government
and army. He placed (预订) an order for a seat in a plane. But when Mr. Brown was about to get onto the
plane, an important army officer came to the airport at the last minute, and Mr. Brown's seat was given to
the officer, so Mr. Brown had to wait for the next plane which was to fly to London two days later.
It was not until he reached London that the high rank officer discovered that the man whose seat he had
taken was the very one whose report he had flown to the city to listen to!
1. Is it easy or hard for ordinary people to travel by plane during the Second World War?
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2. Who knew Mr. Brown's real job?
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3. Why was Mr. Brown's seat given to the army officer?
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4. How do you think the officer would feel when he saw Mr. Brown in London?
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5. When did the army officer find he had taken Mr. Brown's seat?
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