Adjectives describe nouns, and adverbs describe verbs, adjectives, or other adverbs. Always ensure that you are using the correct one for describing a particular word. Since it is the way in which the dogs "treat" (verb) their owners is being described, the best way to correct the underlined sentence above is, "Dogs and cats both make excellent pets, but dogs treat their owners more affectionately."

The use of the word "simultaneous" actually describes the verb "developed," even though it is next to the verb "researchers." The issue can be corrected by making the word "simultaneous" an adverb. "By two researchers simultaneously" is the correct answer choice.

While this sentence describes the way in which "Paula" speaks, her "elocution" is actually acting as a noun in this sentence, and thus an adjective is required. The correct version of this sentence reads, "Paula's elocution is very excellent: she has really become a phenomenal speaker."

Adjectives describe nouns, and adverbs describe verbs, adjectives, or other adverbs. Always ensure that you are using the correct one for describing a particular word. The best way to correct the underlined portion of the sentence above is: "The man's bright smile"

If the man's action of smiling were being described then the adverb "brightly" would be correct.

Because the underlined portion of the sentence is discussing the way in which an action was done, an adverb is required rather than an adjective in this sentence. The correct version of this sentence reads: "The car was moving quickly—in fact, it was going so fast as to be wildly unsafe.

Adjectives describe nouns, and adverbs describe verbs, adjectives, or other adverbs. Always ensure that you are using the correct one for describing a particular word. The best way to correct the underlined portion of the sentence above is: "I vehemently hate the way that cats behave:"

Adjectives describe nouns, and adverbs describe verbs, adjectives, or other adverbs. Always ensure that you are using the correct one for describing a particular word. Since the verb "feeling" is being described in this sentence, the adverbial form "well" is required. The best way to correct the underlined portion of the sentence above is, "I am not feeling very well today; I might just stay in bed all day."

The use of the adjective "perfect" is incorrect in this sentence, as it modifies the verb "handled." A verb can only be modified by an adverb, meaning "perfect" must be changed to its adverbial form. As the only answer choice to use the adverb "perfectly" instead of the adjective "perfect," the correct answer choice is "as it always handled its money perfectly."

The use of the word "frighteningly" is absolutely incorrect, as it is an adverb being used to describe a gerund, or a verb that takes the form of a noun, in "looking." Gerunds need to be modified with an adjective. Therefore, "to the frightening looking motel" is the correct answer.

Adjectives describe nouns, and adverbs describe verbs, adjectives, or other adverbs. Always ensure that you are using the correct one for describing a particular word. The word being modified in the example sentence is the verb "speaking," so the best way to correct the underlined portion of the sentence above is, "Paul was speaking very excitedly; it was hard to understand him."