Dear Amy，
    How are you？This week we did a project on the history of London.
    My grandfather said that London in the 1950s was a terrible place to live because the air pollution was so bad.There were many factories and they caused a lot of smoke.The smoke caused heavy black fog in the sky.The people of London called this "smog".
    Sometimes the smog was so thick that people could not see anything at all.Taxis and buses could not go anywhere as it was too dangerous to drive.The smog was also harmful to people's health，and some people found that it was difficult to breathe.
    In 1965，the government made new laws about the pollution，and the air got much cleaner.Today it is clean and we never see smog in London，and now people find that it is not difficult to breathe any more.
    Since the 1950s，people from all over the world have come to live in London.My grandfather says that this is one of the best changes.Now he can eat food from India，China，Italy and Germany in his neighbourhood.
    I like living in London today，and I am happy to have friends from all over the world.
    Write back soon.
（1）London was a

terrible

terrible

place to live in the 1950s

because

because

of the bad air pollution.
（2）Lots of smoke from

factories

factories

caused heavy black fog called "

smog

smog

".
（3）The smog was sometimes so thick that people could see

nothing

nothing

and the smog was also harmful to people's

health

health

.
（4）The government made new

laws

laws

about the pollution in 1965 and the air today is much

cleaner

cleaner

than before.
（5）Since the 1950s，people

from

from

all over the world have come to live in London and the people there can eat

food

food

from India，China，Italy and Germany in their neighbourhood.