考研英语语法精练答案如下：
1. The book that he borrowed from the library is fascinating.
2. It was not until last night that I realized how important time management is.
3. She has never visited the city before, nor does she plan to do so in the near future.
4. The more exercise you do, the healthier you will be.
5. Although it was raining heavily, the students still arrived on time for the exam.
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