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科学领域的总目标。

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幼儿园科学教育内容选编的原则。

When Francis got back after Easter, he was far behind his classmates and he was ____the second into the third class at his own desire.

The president acknowledged that he had somehow ____his ability to communicate to the American people.

Unfortunately, as history has shown, some of the companies are guilty of misconduct ____profit.