John couldn’t take part in the activity held at the cultural center yesterday for _____ reasons.
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A
series of
B
all kinds
C
the number of
D
a variety of
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It took me quite a long time to ________ the new environment here.
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A
adapt to
B
relate to
C
apply to
D
attach to
The teacher asked a very difficult question. It was Ted who finally ____ a good answer.
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A
came up with 
B
kept up with
C
came up
D
caught up with
The world’s population has grown by ______ it was in 1800.  
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A
more than six times that
B
six times more than that
C
more than six times what
D
six times as many as