The sentence concentrates on small children's abilities to destroy things. Therefore, the contrast implied is between "fragile" and the sentence's blank. Do not be tempted by options like "dull" or "blunt" merely because the parents of young children often have to make their houses safe. The contrast for "fragile" is strong or not easily broken. The word "durable" means just that.

A quick glance at this sentence tells us that we are looking for an adjective that describes a minivan. More specifically, it describes the minivan that Mr. Williams wants to buy. The only other information we are given tells us that Mr. Williams wants a car that will be long-lasting instead of falling apart immediately. The answer choice that accurately describes this quality is "durable," which refers to a product that remains in a good condition over time.

Because the teacher struggled to grade the hand-written essays, we can assume that the handwriting on them was hard to read. The answer choice that most closely resembles this definition is “illegible,” which means unable to be read. To provide further help, “serene” means peaceful; “passive” means not aggressive or not taking the lead; “crafty” means sneaky, manipulative, and clever; “brittle” means easily broken.

Since the railroad runs all the way across the continent, it can be called “transcontinental.” The prefix "trans-" means across. To provide further help, “propulsion” is force that causes movement to occur; “submersible” means able to be covered with water; “humanitarian” means compassionate and helpful towards one’s fellow man.

The description of the witness suggests that he was visibly nervous, likely because he was lying. In other words, his behavior made him seem not believable. The best answer choice is “credible,” which is a synonym of "believable." To provide further help, “incredible” means great, brilliant; “intelligent” means smart; “devout” means very religious; “praiseworthy” means laudable, deserving of praise. 

From the context of the sentence, we know that the lights were tangled. We need a word that means the same as "tangled," which is "convoluted."

The cast had a lot to do in a little time, so they would most likely be "frantic."

The key to this sentence is the word overkill that indicates excess measures were taken; this means they were most likely "drastic" or exaggerated measures. The other words mean the following: "miniscule" is tiny; "concrete" is finite; "subtle" is barely noticeable; and "sublime" is awe-inspiring.

Since the student was outspoken, it means that she's likely, or "prone," to speak out in class. The other incorrect answer choices mean the following: "earnest" is to be sincere; "moved" is to be affected; "disinclined" is to be discouraged; and "deft" is to be skilled.

Since the wait was lengthy, this indicates that from the child's perspective, it seemed "infinite" or never-ending. The other answer choices mean the following: "robust" means healthy; "subtle" means delicate; "cursory" means quick, and "momentary" means fast.