---Mr Wang, I have trouble ________ the text.  ---I’m sure you can, but remember ________ it at least three times. 
#43725
A
to understand; reading
B
understanding; reading
C
to understand; to read
D
understanding; to read
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Now more and more people ________ sending e-mails ________ letters.
#43291
A
prefer to; to writing
B
prefer to; to write
C
prefer; to writing
D
prefer; to write