This sentence contains a misuse of an adverb. The word "quickly" is meant to describe the noun "response," but adverbs cannot describe nouns. What is needed here is the adjective form of the word, which is "quick." The proper choice is, "Ahmed was known for his quick." 

The word "fast" is supposed to modify the word "built." Adverbs modify verbs, but "fast" is an adjective. The correct choice is "quickly" (fastly is not a word). While "with speed," is technically also correct, it adds another word, which makes it less concise. The correct choice is, "Jenny built programs quickly."

This sentence contains a modifier error. The word "rapid" is supposed to modify the word "are changing," but rapid is an adjective, which only modify nouns and pronouns. What is needed here is an adverb: a word that describes verbs and adjectives. The correct word would be "rapidly." The correct choice provided below is, "The Internet and texting are rapidly changing."

When a comparison is made, "better" should only be used for a comparison of two individuals, while "best" is the appropriate superlative for comparisons involving three or more individuals. This means that in this sentence, "better" should be changed to "best." The correct answer is the only answer choice that makes this change: "by far the best of the five."

The original sentence uses the superlative "tallest" when the comparative "taller" is correct. One can only be "tallest" among a group of three or more. Furthermore, the size of the group determines whether "between" or "among" is correct. "Between" is appropriate for a small group of specific objects. Compare "between New York and Pennsylvania" and "among the states of the union."

In this sentence "Out of all the possible outcomes" sets up the use of the superlative by suggesting that there are more than two possible outcomes, and that bankruptcy was the single worst of these many options. The correct answer is thus, "Of all the possible outcomes, bankruptcy was certainly the worst."

Unless it is explicitly stated that there were only two possible outcomes, it is incorrect to use "worse," which is a comparative adjective and would only be used if it was specifically stated that the comparison was being made between two outcomes.

When comparing only two different people or things, as happens in this sentence between "the twins," the appropriate adjective is "better." In this sentence, both instances of "best" should be changed to "better." Therefore, the correct answer choice is "the boy was the better athlete, while the girl was the better artist."

The use of the word "both" in the example sentence makes it clear that Carla only has TWO jobs; therefore, a comparative adverb ("better") must be used instead of a superlative adverb ("best"). Superlative adjectives and adverbs are used only when more than two items are being compared in a sentence. The correct version of the sentence reads, "Carla enjoys both her jobs, but overall she likes working at the book store better."

Whenever you are comparing only two things, use the comparative form (usually words ending in "-er"—better, smarter, faster, and so forth). If there are three or more items, use the superlative form (usually ending in "-est"—best, smartest, fastest . . .) to designate the best one.

We use comparative adjectives when comparing two people or things (bigger, worse); we use superlative adjectives when comparing one person or thing with three or more people or things (the biggest, the worse).