What does the Latin abbreviation "ibid.", found in bibliographies, mean?

Traditionally, how does a proofreader indicate that words or instructions written on a proof SHOULD NOT literally be set into type?

What is the distinction in usage between "toward" and "towards"?

Which uses the homophone correctly?

Which sentence has the right spelling?

Identify the sentence written in active voice.

Which of the following sentences is grammatically INCORRECT?

Which sentence uses "their," "there," or "they're" correctly?