Based on the structure of this sentence you are looking for the answer choice that means easily lit on fire. The correct answer is therefore "inflammable." Due to a strange quirk of the English language both "flammable" and "inflammable" mean easily set on fire. Based on normal rules you would expect "inflammable" to mean "not flammable," but this is not the case. Additionally, "inflexible" means not flexible, not bendy; "irresponsible" means not responsible; "implacable" means unable to be placated, unable to be soothed, unforgiving; "irredeemable" means not able to be redeemed, not able to be saved or forgiven. 

The subject of this sentence wants to change how well he fits in at school, so it makes sense that he would feel the need to change his appearance. You are therefore looking for the answer choice that means change, alter. So, the correct answer is "modify." Additionally, "ransack" means to search through carelessly and quickly; "reconcile" means make peace with; "deviate" means turn away from, diverge from; "contradict" means argue against.

Based on the context clues in this sentence, we can guess that Ronald didn't realize that the temperature was dropping. As someone who is naturally warm, he probably thought the house was just about the same. Therefore, the implication is that he didn't even think that others might be cold. That means that he likely did not realize it. He was not aware of it.

The use of the word "but" is crucial to solving this problem. "But" is used to change the direction of a sentence, to cause it to mean the opposite, so in this instance if the girl is twenty minutes late she must usually not be late. The correct answer is therefore "prompt" which means on time, quick, not delayed or late. Additionally, "dogged" means determined and hard-working; "delayed" means late, halted, paused; "miserable" means very sad; "perilous" means dangerous.

The key to solving this problem is the use of the word "although." "Although" is used like "however," "yet," and "but" to introduce an opposite or contrasting idea. So, most of these answer choices would be better served with the conjunction "and" which is used to continue an idea. The correct answer is therefore " . . . I could be wrong." The author is unsure of themselves and this is reflected in the words "think" and "although."

To solve this problem you simply need to recognize which of these conjunctions makes the most sense within the context of this sentence. The correct answer is " . . . due to terrible weather." "Due to" means because of. All the other conjunctions are either completely nonsensical in the structure of this sentence or else would only make sense if the journey was not cancelled. Additionally, "favorable" means advantageous, offering some benefit.

The use of the conjunction "despite" tells you that the day in question did not live up to the "hype" (excitement). The day must therefore have been devoid of action, boring and normal. The correct answer is therefore "uneventful." Something that is described as "uneventful" is something mundane that is not interesting. Additionally, "giddy" means light-headed and dizzy or excited; "optional" means not required, a choice; "insolent" means rude and obnoxious; "degraded" means treated with disrespect and made to feel worthless.

The sentence talks about how the world is changing and complex. This implies that people rarely "settle" on one political opinion. While this means that people may not be happy with their opinions, we really can't say much about happiness, given our clues. We must be as vague as the sentence itself is. Therefore, the best option is merely "certain." To be "certain" is to be sure and settled about something. This is as much as you can say for this sentence.

The sentence implies that the image in the window was not what it appeared to be.  For this reason, the best option is "illusion." When something is an "illusion," it appears to be one thing while being another. Often, we speak of "optical illusions." These are just a particular kind of illusion, namely one that we see with our eyes. (Indeed, in this sentence, the illusion is optical!)

The key thing to notice is the fact that the nation has changed "from" being a foe "to" its current status. Thus, you should pick an option that best expresses this contrast to being a foe. It is for this reason that "ally" is the best option. An "ally" is someone who has friendly relations with another group. Thus, to go from being a foe to being an ally means that someone goes from being an enemy to being a friend. This is the best option among those given.