参考答案及解析：

　　1.The correct answer is B

　　The error in this sentence occurs at (B), where an inappropriate verb form creates a sentence fragment. To fix this problem, the phrase “sharks, living” should be changed to “sharks live.”

　　2.The correct answer is D

　　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 B

　　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.

　　4.The correct answer is A

　　The error in this sentence occurs at (A), where there is an improper idiom. The phrase “in addition to” is needed in place of “also.”

　　5.The correct answer is A

　　The error in this sentence occurs at (A), where there is an inappropriate idiom. The idiom is “Between x and y,” not “Between x to y.”

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