In the sentence "The student who studied the hardest received the highest grade," what is the relative clause?

Identify the sentence with correct use of the ellipsis:

What is the correct form of the sentence? "I prefer to work alone than in a group."

Choose the synonym for "ephemeral":

Identify the sentence with the correct use of the semicolon:

What is the correct form of the sentence? "Between you and I, this secret is hard to keep."

What is the correct word usage? "His actions were deemed __________ by the committee."

Choose the sentence with correct subject-verb agreement:

Identify the appositive phrase in the sentence: "My best friend, a talented musician, is performing tonight."

Choose the sentence with correct use of the adverbial clause: