If a sentence is describing how “one” should behave, it creates discontinuity to then begin using the word “you” instead of "one" later in the sentence. Therefore, “you” should be replaced by the word “one" to correct the error, and the correct answer is "it is polite to bring a gift so that one appears to be grateful."

When two items are being compared, “more” is the appropriate word to use, while “most” is appropriate for comparisons involving three or more items. Here, two items ("red and white wine") are being compared. Therefore, “more” is the appropriate word to use, not “most.”

In this sentence, the adjective “meticulous” modifies the verb “worked.” Given that adverbs can only modify verbs, the proper word to use would instead be “meticulously,” which is an adverb. 

This sentence does not comply with the idioms that govern which prepositions should follow verbs. The phrase, “run as mayor” is incorrect because idiomatically, it should be “run for mayor.” Therefore, the correct version of this sentence would read, "The English teacher, after working in the public school system for fifteen years, decided to run for mayor of her small town."

"Which” is used to show that there is modification to a phrase when the modification comes after a comma. “That” is used to show that there is a modification to a phrase in which there is not a comma after the subject being modified. Here, "that studio's latest movie" is being modified by the part of the sentence after the comma. Therefore, “which” is appropriate, not “that.”

“Your” is used to show possession, while “you’re” is a contraction of “you are.” The appropriate word for this sentence is “you’re,” not “your,” since possession is not being shown. Therefore, the correct form of this sentence is: "If you’re going to major in English, it is wise to read in your spare time in order to develop keen critical reading skills." (Additionally, "its" is possessive while "it's" means "it is.")

“Your” is used to show possession, while “you’re” is a contraction of “you are.” The appropriate word for this sentence is “your,” not “you’re,” since possession is being shown. Therefore, the correct form of this sentence is, "No matter what your age is, it is still possible to learn new subjects, develop new skills, and discover new interests."

When two items are being compared, “worse” is the appropriate word to use, while “worst” is appropriate for comparisons involving three or more items. Here, two items ("poverty in Haiti and Somalia") are being compared. Therefore, “worse” is the appropriate word to use, not “worst.”

If a sentence is describing how “one” should behave, it creates discontinuity to then begin using the word “you.” “You” should be replaced by the word “one" in the sentence as it is written to correct this error. Also, the phrase "in order" is not necessary and the sentence is more concise without it. 

When two items are being compared, “less” is the appropriate word to use, while “least” is appropriate for comparisons involving three or more items. Here, three items are being compared. Therefore, “least” is the appropriate word to use, not “less.”