The phrase "which is one of the largest buildings in the world"  is an example of a relative clause, which gives more information about its antecedent: the Willis Tower. Any such phrase that occurs in the middle of a sentence must be introduced and completed with a comma. The correct answer choice is "The Willis Tower, which is one of the largest buildings in the world, was built."

In this sentence, two independent clauses are being joined by a coordinate conjunction. When this occurs, a comma must come before the coordinate conjunction. The correct answer choice is "because he is honest, and he likes to help others."

The phrase "Jogging around his neighborhood" is an example of a introductory phrase, explaining information necessary to the context of the sentence, but outside of the main sentence, grammatically. These types of phrases must be followed by a comma in order to separate them from the rest of the sentence. The correct answer choice is "Jogging around his neighborhood, he saw something strange."

The phrase "listening to music" is a parenthetical expression: a phrase that explains more about a particular word or phrase in the sentence, but is not introduced by a relative pronoun. These phrases must be introduced and completed with a comma in order to separate them from the main clause of the sentence. The correct answer choice is "The girl's favorite pastime, listening to music, eventually lead to her career as a professional singer."

The phrase "to bond fish and test out their survival skills" is a list of actions. All items in any sort of list/parallel words or phrases should be separated by commas. Additionally, a comma must come before the "and" because the action "fish" and "test out their survival skills" are not necessarily related, so they should not be grouped together. The correct answer is "in order to bond, fish, and test out their survival skills."

The phrase "Having completed all her requirements" is an example of a introductory phrase, explaining information necessary to the context of the sentence, but outside of the main sentence, grammatically. These types of phrases must be followed by a comma in order to separate them from the rest of the sentence. The correct answer choice is "Having completed all her requirements, she."

The phrase "who was on the company's board of directors" is an example of a relative clause, which gives more information about its antecedent: "Amir." Any such phrase that occurs in the middle of a sentence must be introduced and completed with a comma. The correct answer choice is "Amir, who was on the company's board of directors, wanted"

The phrase "who were currently going through training"  is an example of a relative clause, which gives more information about its antecedent: employees. Any such phrase that occurs in the middle of a sentence must be introduced and completed with a comma. The correct answer choice is "Few of the new employees, who were currently going through training, were expected."

In this sentence, two independent clauses are being joined by a coordinate conjunction. When this occurs, a comma must come before the coordinate conjunction. The correct answer choice is "The man always had to explain what he did for a living, yet he felt that people"

The phrase "While driving his car on the highway" is an example of an introductory phrase, explaining information necessary to the context of the sentence, but outside of the main sentence, grammatically. These types of phrases must be followed by a comma in order to separate them from the rest of the sentence. The correct answer choice is "While driving his car on the highway, the man happened to see a billboard."