John asked Tom ____ give him a lift to the office. 
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A
if he could
B
could you
C
if could he
D
if could
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 The book is _______ that one.
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A
three time as long as
B
three times as longer as
C
as three times longer as
D
three times the length of
He felt       to work for human rights and progress.
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A
it his duty
B
his duty
C
that is a duty
D
that is his duty