Cleveland is a possessor (of "main attractions") in this sentence, and therefore the added possessive "s" should include an apostrophe as well: "Cleveland's." Since there are only two items in the list ("the Rock & Roll Hall of Fame and a Botanical Garden"), no comma is necessary to separate the two.

This sentence misuses an apostrophe. Even thought the word "her" is possessive, that does not make "horses" possessive. The apostrophe should be omitted for this reason. Note that you should never pluralize a word with an apostrophe. The correct choice is, "Magaret took her horses out of the stable."

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 misuses the word "its'." In fact, "its' " is not a word at all. What is necessary in this spot is the possessive form of "it," which is "its (no apostrophe)." No other changes are necessary. The correct choice is, "gave its employees particularly big bonuses this year."

This sentence misuses an apostrophe. Apostrophes should never be used to pluralize a noun. The correct plural of "stock" is "stocks." The correct answer choice is, "people invest in stocks."

This sentence misuses an apostrophe. It is clear from the context that the word "company" should be plural; however, you should never use an " 's" in order to pluralize a word. The correct plural form of "company" is "companies." The correct choice is, "the companies nearby, she was unable to interest them."

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 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."

The correct possessive form of men (a plural word) is "men's." There should be no apostrophe used in the word "daughters," as they do not possess anything in this sentence.

This sentence contains an apostrophe usage error. The word "it's" is a contraction for "it is," while it is being used as a possessive pronoun in this sentence. The correct form is "its," making the correct choice "a monopoly because it was acquiring many of its competitors very quickly."