题目内容
The assistants were authorized to take whatever action they ______ necessary.
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为保证邮件安全，目前最流行的方法是（）技术。
The management control process should ______ to measure whether predetermined goals are being achieved.
During the business intervals, customers appreciate the guest rooms which are full of pictures and other beautiful ______.
At the beginning of each course, the teacher should give a very ______ explanation of his plan for this course.
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