—What do you think of teacher，Bob?—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
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推荐题目
We went through a period _____ communications were very difficult in the rural areas.
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Time is of no importance to great thoughts，________ are as fresh today as when they first passed through thinkers' minds ages ago.
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We’re in a stage _____ it’s still too early to say who will win the most votes and become the new President.
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