题目内容
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The increasing population is the greatest c________ of the world today.
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Where were you b________ 4∶00 and 6∶00 yesterday afternoon?
—Mum, will you please a________ me to take part in that party?
—OK, dear.
There are four o________ on the earth.
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They c________ to the police about the noise from the bar.
You should be very careful if you use c________ cards to buy things on-line.
