Final answer:
The correct answer for the student's question is 'and.' The review questions also address comma usage regarding coordinating conjunctions, independent and dependent clauses, introductory phrases, and lists. The use of commas should adhere to standard punctuation rules.
Step-by-step explanation:
The sentence provided by the student should correctly be completed as: I passed the test and felt relieved. The word and is the appropriate choice because it is a coordinating conjunction that connects two independent clauses that are related in context.
In addressing the other review questions for inserting or omitting commas:
- I finally found my keys, and I got to work just in time. (A comma should be added before the coordinating conjunction 'and' when it joins two independent clauses.)
- Mrs. Contreras threw out her old coffee table and cleaned the carpet. (The comma should be omitted because it separates two verbs connected by the coordinating conjunction 'and' that share the same subject.)
- Taking the elevator to the roof, we hoped we could see the skyline, and the bay. (The first comma is correctly placed after the introductory phrase. The second comma before 'and' is unnecessary unless it is being used for stylistic reasons, such as to indicate a pause.)
- Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy. (A comma is added after the introductory clause and before 'and' in a list of three or more items.)
- I let my neighbor borrow my phone because she said hers was tapped by the police. (The comma before 'because' should be omitted as the reason provided is essential to the meaning of the sentence and does not represent an independent clause.)
When inserting or omitting commas in sentences, it's important to consider the roles of coordinating conjunctions and whether the clauses are independent or dependent, as well as other punctuation rules for introductory phrases and lists.