In the old days ,in Lodon ,the smog was very thick .Car and bus drivers （1）to drive very slowly .They （2）saw the road in front of them even during the daytime .People did not like going out in the smog .（3）they had to go out ,they wore “smogmask “ over their faces .
In December 1952,a very （4）dark cloud came down over London .It was the （5）smog Londoners had ever had .（6） of it was bad factory smoke .Nearly fifty people died in rpad accidents .But many more people became unhealthy .The smog was very （7）for old people and children .One man said ,“The streets were almost （8）because people stayed at home as much as possible.The air was very thick ,and you could almost cut it with a knife .”
After three weeks ,the smog began to （9）.But in the following weeks and months over 4000 people died as a （10）of the smog.
1.A.hurried B.stayed C.had D.stopped
2.A.easily B.hardly C.already D.freely
3.A.If B.So C.Though D.Because
4.A.clear B.thick C.thin D.small
5.A.hottest B.nicest C.worst D.best
6.A.Much B.Many C.A few D.A little
7.A.favourite B.strong C.dangerous D.weak
8.A.empty B.full C.dirty D.clean
9.A.remember B.forget C.arrive D.lift
10.A.part B.usual C.end D.result