Question

Fill in the blank with the most appropriate word.

You ____ book the tickets for the play in advance; they sell out quickly.

• A. Must
• B. Should
• C. Have to
• D. Would

Answer 1

Answer: (B)

Should

Modal Verbs show us the attitude of the speaker to what is being said or done. The term "modal" means expressing mood and mood is a way to express the attitude of the speaker.

Option B is the correct answer because it expresses the mood of duty or correctness.

Whereas option A suggests obligation; option C is similar to option A; option D expresses unsure certainty with which certain act is to be done in future.