參考答案及解析：
　　1.The correct answer is C

　　The error in this sentence occurs at C. The plural verb “have” does not agree with the singular subject “writer” and should be replaced with the singular verb “has.”

　　2.The correct answer is C

　　The error in this sentence occurs at (C), where there is subject-verb disagreement. The plural verb “make” does not agree with its singular subject, “An abundant supply.”

　　3.The correct answer is D

　　The error in this sentence occurs at (D), where there is an improper idiom. What follows each part of the “both...and” construction must be grammatically parallel, but here “both” is followed by the article “the” while “and” is followed by the noun “television programmers.”

　　4.The correct answer is D

　　The error in this sentence occurs at (D), where there is improper pronoun use. The plural pronoun “those” should be used to refer to the plural noun “seas.”

　　5.The correct answer is D

　　The error in this sentence occurs at (D), where there is illogical pronoun reference. There is nothing in the sentence to which the singular pronoun “it” can logically refer. The plural pronoun “they” is needed to refer to the plural noun “handcuffs.”