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In the old days，in London，the smog was very thick. Car and bus drivers 1_______ to drive very slowly they could 2_______ see 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 smog masks over their faces．)Z*E3U4Z2e*@*^/T
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 road 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．”)Z*E3U4Z2e*@*^/T
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．)Z*E3U4Z2e*@*^/T
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