The young pianist is very excited because the concert given by him has never been ____ . 
#19397
A
successful
B
more successful
C
most successful
D
the most successful
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. Many people think that it is ____________making such an experiment.
#19913
A
worthwhile
B
worth
C
worthy
D
valuable
She is an American,but she likes learning Chinese.She says Chinese is ________ English. 
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A
as popular a language as
B
so popular a language as
C
as a popular language as
D
so a popular language as