Pudong International Airport is one of_______ airports in the world.
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A
big
B
bigger
C
the bigger
D
the biggest
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 Now the weather is becoming ___________ , we should look after ourselves well.
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A
cold and cold
B
the coldest and coldest
C
colder and colder
D
colder and coldest
Many Chinese students think science subjects are _______ foreign languages.
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A
more difficult as
B
less difficult than
C
much difficult than
D
so difficult as
I’m proud to be able to help __________people. 
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A
too much
B
so much
C
so many
D
such many