It is very kind _____ you to help me with my lessons because it is very difficult _____me to learn them well.
#50539
A
of； for
B
of； of
C
for；of
D
for； for
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The 30th Olympic Games will be held in London _________ July 27 to August 12th , 2012 .
#48559
A
on
B
in
C
at
D
from
—Guess, how much does it cost?—I think it costs 15 and 20 dollars.
#50233
A
from
B
between
C
among
D
with