It was a very foggy day in London. The fog was so thick that it is impossible to see more than a foot or so. Buses, cars and taxis were not able to run and were standing by the side of the road. People were trying to find their way about on foot but were losing their way in the fog. Mr. Smith had a very important meeting at the House of Commons (英国议会下院) and had to get there but no one could take him there. He tried to walk there but found he was quite lost. Suddenly he bumped (撞上) into a stranger. The stranger asked if he could help him. Mr. Smith said he wanted to go to the House of Parliament (英国议会) . The stranger told him he would take him there. Mr. Smith thanked him and they started to walk there. The fog was getting thicker every minute but the stranger had no difficulty in finding the way. He went along one street, turned down another, crossed a square and at last after about half an hour's walk they arrived at the House of Parliament. Mr. Smith couldn't understand how the stranger found his way. “It was wonderful, ” he said, “How did you find the way in this fog?”

　　“It was no trouble at all to me,” said the stranger. “I am blind. ”

1．This story perhaps happened in ________ .

[　　]

2．Mr. Smith was a(n) ________ person.

[　　]

3．The phrase “bumped into” means ________ .

[　　]

4．The stranger seemed ________ .

[　　]

A．to know this area well

B．to have some problems in finding the way

C．to be a tourist guide (导游)

D．to know Mr. Smith

5．The stranger could find the way in the fog without much trouble because ________ .

[　　]

 There are many ________(fog) days in London.

Many flights ______________ because of the heavy fog (雾) in Beijing airport.

A. were put on B. were put in C. were put off D. were put up