题目内容
The development of the world’s e_______ will bring about many new problems.
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Sometimes, e-mail can be the most _________ form of communication, for messages can be exchanged within a very short time.
We have invited an expert ______ this area to give us a speech.
If you are too busy, just call me to help ________.
His knowledge is only limited ________ what is taught in class.
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