参考答案及解析：

　　1.The correct answer is D

　　Explanation

　　Choice (D) is correct. It avoids the connectives error of the original by using the proper connective "not only...but also" to join the two prepositional phrases, "for its innovative design" and "for its environmentally friendly building practices."

　　2.The correct answer is D

　　Explanation

　　The error in this sentence occurs at (D), where there is an illogical comparison. It does not make sense to compare “rooms on the top floors” with “the lower floors.”

　　3.The correct answer is E

　　Explanation

　　There is no error in the sentence.

　　4.The correct answer is B

　　Explanation

　　The error in this sentence occurs at (B), where there is an inappropriate verb form. It does not make sense to say that George would prepare for a speech that “he was given” (that was given to him). Instead, “he was to give” is needed.