Hearing loss in a large number of teenagers______ caused because of their listening to loud music.
#90729
A
is
B
has
C
are
D
have
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 We looked everywhere for the keys, but they are nowhere _______.
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A
to find
B
to have found
C
to be found
D
being found
Without facts,we cannot form a worthwhile opinion,for we need to have factual knowledge ______ our thinking.
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A
upon which to base
B
which to be based on
C
which to base on
D
to which to be based on