5. 解析:　 选A。考查时态和语态。由提供的信息“They hope to complete it by the end of this year”可知,图书馆应是正在(被)建设中，故用现在进行时的被动语态。

4. 解析:　 选D。考查非谓语动词和语态。句意为：自从去年上台执政的政党采取了很多发展经济的措施，人们的生活发生了很大变化。在ever since引导的从句中，took是句子的谓语，come to power (上台执政)在句中作定语，与被修饰词congress是逻辑主谓关系，故用现在分词表示主动；take place (发生)无被动语态。故选D项。

3. 解析:　 选B。replace代替，取代，通常与with连用；convert改变，转变，比较正式；return归还，回来。

2. 解析:　 选A。考查动词短语辨析。bring in 赚钱，引进，让参加; bring about 导致，造成；bring up 提出，养育；bring out 阐明，推出。句意为：为了得到不同的观点，我可以让一些专家参加这个节目吗?故选A项。

5. In the past, he earned his living by carrying bricks ten hours a day.

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4. The key to keeping good health is to eat and sleep regularly.

3. They are making a complete list of all the plants in the nature reserve.

2. Because of their dedication and hard work, the two outstanding scientists have really made a difference to the lives of millions of people in two continents.

5. supported

3. being burnt 4.discovered; invented