As is known to all language learners, the newly learnt words will soon be forgotten unless ______ used in everyday communication.
#22683
A
gradually
B
frequently
C
accurately
D
familiarly
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Paper produced every year is ________ the world’s production of vehicles. 
#22206
A
the three times weight of
B
heavier three times than
C
as three times heavy as
D
three times the weight of