题目内容
By 1990, production in the area is expected to double ________ of 1980.
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Professor smith and Professor Brown will ________ in giving the class lectures.
Understanding the cultural habits of another nation, especially ________ containing as many different subcultures as the United States, is a complex task.
The manager promised to have my complaint ________.
You can’t be ________ careful in making the decision as it was such a critical case.
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