题目内容
There are ________ periods in an animal’s life when it is capable of learning a great deal in a very short time.
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Do employers in your country ________ workers for in juries suffered at their work?
Since they betrayed us, they have no hope of convincing ________ their sincerity.
They assured us that ________ was waiting for they were there to share it.
________ exposure to dirty air can cause people suffer from some diseases.
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