This sentence misuses an apostrophe. The word "cars" is simply the plural form of the word and is not possessive. Apostrophes should never be used in order to pluralize a word. The correct choice is, "On the weekends, Timothy drove cars."

This sentence does not contain an apostrophe where one is necessary. The word "companies" is supposed to be possessive, but this is not the plural form. The necessary form is "company's." The correct choice is, "Thankfully, the company's Human Resources department did not."

This sentence misuses an apostrophe. The word "company's" should be the plural form, which is "companies." Apostrophes should never be used in order to pluralize a word. The correct choice is, "The prevalence of companies without profits make many fear."

This sentence misuses an apostrophe. The plural of the word "language" is "languages." Apostrophes should never be used to pluralize a word. The correct choice is, "Among the languages that Misha wanted to learn were."

This sentence misuses an apostrophe. The word "dogs" in the context of this sentence should be the plural form of the word "dog;" however, you should never use an apostrophe to pluralize a word. The correct choice is, "After she took her dogs for a walk, she decided."

This sentence misuses the apostrophe. The context of this sentence indicates that multiple companies' personnel are gathering; in other words, the word "company" should be in the plural form: companies. An apostrophe should never be used to pluralize a word. The correct choice is, "The heads of the companies gathered periodically."

This sentence misuses an apostrophe. The word "his" is already possessive and does not need an apostrophe. This mark should be omitted altogether from the sentence. The correct choice is, "He always tried to encourage his students to try"

This sentence misuses an apostrophe. Since the word "his" is already possessive, there is no need for the apostrophe. It should be omitted. The correct choice is, "His report indentified many."

Quotation marks within quotation marks is mechanically incorrect. When referring to the title of an article, it is correct to place the title within quotation marks; however, when those quotation marks are within quotations, one should replace the quotation marks with apostrophes. The correct answer uses single quotation marks, the rest of the sentence is correct as written.

This sentence contains an error in the placement of the apostrophe. The word "hills" is the plural form of the word and should not contain an apostrophe (which would make it possessive). Note that apostrophes are never used to pluralize a word. Omit any and all apostrophes; the correct choice is, "Though the hills seemed small, the journey."