This sentence misuses a semi-colon. These should be used to separate two independent clauses, so either side should be able to stand on its own as a sentence. Here, the latter half of the sentence is not an independent clause and cannot stand on its own, so you should use a comma instead: "The community members voiced various complaints, such as their distrust of the new energy company buying up local property."

A comma should be used instead of a semicolon to separate the introductory phrase "without their best player" from the rest of the second independent clause "the team didn't have a chance of winning."

A semicolon is meant to connect two thoughts that are both independent clauses. However, the second clause here is dependent and is connected by the word "so." In this situation, a comma would be appropriate to link that subordinate clause to the first independent clause. So, the corrected sentence would read, "That book over there belongs to Eileen, so we should help return it to her before she needs to study for the massive English test next week."

The option with an error is “hiking; and she.” Semicolons can be used to separate two phrases that could each stand as their own sentence but are related to each other in topic. The problem with “hiking; and she” is that the semicolon is being used to separate two ideas that are related, but the material that follows the semicolon is a fragment and cannot stand as a sentence on its own. This problem could easily be corrected by removing the “and” so the entire passage reads, “Abigail’s favorite pastime was hiking; she often hiked with friends in the mountains near her house.” 

The error in this sentence arises where we are told that Bianca and her sister disagree over their parents' divorce, but her sister is presented abstractly; the correct usage of "her sister" allows the individual mentioned to be presented in relation to Bianca. Without the "her," we cannot be certain what the relation is, although it is clearly indicated elsewhere in the sentence.

This sentence has an ambiguous pronoun. To whom does "she" refer? You could fix this either by referring to both women with "they," if it is indeed the case that both were honored at the awards ceremony after dinner, or by replacing "she" with the name of the woman being specified.

This sentence contains an ambiguous pronoun. We don't know whether "him" refers to Mr. Harris or Mr. Jarvins, so "him" is the error in the sentence. If we wanted to fix the error, we would have to replace "him" with the unique name of the person—Mr. Harris or Mr. Jarvins—being considered for the promotion.

This is an ambiguous pronoun. We are not sure to whom "her" refers. The sentence should use her name.

"They" is an ambiguous pronoun reference—it could refer to either "experts" or "children."

The error in this sentence is the use of the word "it" to refer to "several bags of clothing." In this case, the pronoun—"it"— is singular when it should be plural ("them").