When you have a large number of pests, it is called an “infestation.” So a house with lots of rats (that are not pets) in it is said to be “infested” with rats. The word “determined” means really wanting and working hard to do something; “mistaken” means incorrectly understood or wrong; and "devoid" (used in the phrase "devoid of") means lacking completely or having none of.

Given that Anna had never before seen a play before, the experience would best be described as something new and special. This is what "novel" means, and so it is the correct answer. A tempting wrong answer is "unusual." However, this is not the right answer because it does not capture the specialness of the experience for Anna.

This sentence describes a happy and loving connection between Jessica and Joey. The word that would best complete this sentence would be one that conveys this love and happiness. The best word for this would be "harmonious," which is therefore the correct answer.

The correct answer will be an adjective that best describes the light emitted by a firefly. "Fluorescent" means luminescent and bright. This describes the light put out by a firefly well, and so it is the correct answer.

In this sentence, the tiger is snarling and clawing at the gate, behaviors that exhibit the expression of antagonism and aggression. The other answer choices fail to convey the negative sentiments that the tiger is displaying. Therefore, "aggressive" is the best answer.

You are looking for an answer choice that describes someone whose "stomach hurts" after eating too much. This should lead you to the correct answer, which is “queasy.” If you are feeling “queasy,” you feel like you are going to throw up. To provide further help, “frightened” means scared; “serene” means quiet and peaceful; someone who is “remorseful” feels sad or guilty for something bad they have done; and something “suspicious” is something that looks out of place or could cause trouble, though it has not yet started to do so.

We can infer that because "the windows . . . were so dusty that they . . . prevent[ed] anyone from seeing inside," we need to pick out an adjective to describe the dusty windows that means something like "not clear." That means that "transparent" cannot be the correct answer, because "transparent" means "of a material or article: allowing light to pass through so that objects behind can be distinctly seen," making it an antonym, not a synonym, of "not clear." "Opaque," however, is an adjective that means "not able to be seen through; not transparent," and because "opaque" best describes the dusty windows that no one can see through, "opaque" is the correct answer.

If Bobby did not lose the keys, he would be innocent of the accusations, so "innocent" is the correct answer. "Guilty" is the opposite of the word for which we're looking. The sentence tells us nothing about whether or not Bobby is "convicted" or "shy," and "disengaged" means disinterested, which also makes no sense.

We need to pick out an answer choice that means something like "let down" or "exposed" because the sentence tells us that Blair told the whole school about Mikayla's embarrassing incident. So, "betrayed," an adjective that means double-crossed or revealed information one promised to keep secret, is the correct answer choice because it best fits the sentence's context. None of the other answer choices would make sense in the blank space: "elated" means very happy; "confident" means self-assured; and "helped" means assisted.

Gray, cloudy weather often makes people feel gloomy, which is the same as feeling "morose," because "glum" means gloomy and sad.

"Happy" and "excited" are opposites of the word for which we're looking, and "confused" doesn't make sense either. "Devastated" is too strong of a word for this sentence, as it means feeling extreme grief or shock; we don't have enough information here to conclude that the speaker is "devastated."