题目内容
Many important scientific discoveries are in fact ________ones as they were made by chance.
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Government officials all factories and mines to make sure that they are safe for workers.
The teachers must their efforts on developing the students’ ability to use English.
During the day casual wear will be ________ . but formal wear will be required in the evenings
Some people are very set in their ways, but others have a more attitude to life.
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