1. 答案：The book, which was published last year, has become a bestseller.
解析：此处使用了定语从句，关系代词"which"指代先行词"the book"，引导非限制性定语从句。
2. 答案：Despite the heavy rain, they managed to finish the construction on time.
解析：此处使用了介词短语作让步状语，"Despite the heavy rain"表示尽管下大雨。
3. 答案：The more you practice, the better you will become at playing the piano.
解析：此处使用了"the+比较级...，the+比较级..."结构，表示“越……越……”。
4. 答案：She has been working on the project for two weeks, and she is almost finished.
解析：此处使用了现在完成进行时，表示动作从过去开始，一直持续到现在，并且可能还会继续。
5. 答案：It is important that we should keep the environment clean.
解析：此处使用了虚拟语气，"should"可以省略，表示建议或要求。
6. 答案：The teacher explained the difficult concept in a way that was easy to understand.
解析：此处使用了定语从句，关系代词"that"在从句中作方式状语。
7. 答案：Although he is very tired, he continues to work hard.
解析：此处使用了让步状语从句，"Although he is very tired"表示尽管他很累。
8. 答案：Not only did he finish his homework, but he also helped his classmates.
解析：此处使用了"not only...but also..."结构，表示不仅……而且……
9. 答案：If I had known about the discount, I would have bought the dress.
解析：此处使用了虚拟语气，表示与过去事实相反的假设。
10. 答案：She has been living in this city for five years, and she has become very familiar with it.
解析：此处使用了现在完成时，表示动作从过去开始，一直持续到现在，并且对现在有影响。
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