The theme for today's sermon is "honesty".

Here are the answers to the questions:

22. The theme for today's sermon is "honesty".

• The word "theme" refers to the main subject or topic of a talk, piece of writing, or sermon.
  • The correct option is D. theme.

23. The saying, "All the world is a stage" is attributed to Shakespeare.

• To "attribute" something to someone means to regard it as belonging to or produced by them.
  • The correct option is B. attributed.

24. One needs an opponent to argue in a debate.

• An "opponent" is someone who competes with or opposes another in an argument or contest.
  • The correct option is D. opponent.

25. The new headmaster gives his first address to the students this evening.

• "First" is used to indicate the initial or earliest in a series of events or actions.
  • The correct option is B. first.

26. The crime was prevented by the vigilance of the police.

• "Vigilance" means the action or state of keeping careful watch for possible danger or difficulties, which is how police prevent crime.
  • The correct option is D. vigilance.

27. Rosemond's credentials show she is qualified to manage the firm.

• "Qualified" means officially recognized as being suitable for a particular job or position, which is what credentials demonstrate.
  • The correct option is A. qualified.

28. The protracted dispute between the royal families has now been settled.

• "Protracted" means lasting for a long time or longer than expected, which fits the context of a dispute that has finally been settled.
  • The correct option is C. protracted.

29. It has become a celebration gifts on Valentine's Day.

• Giving gifts on Valentine's Day is a way of observing or marking the occasion, which is a form of celebration. The phrase should be "a celebration of gifts" or "a tradition of giving gifts". Assuming "celebration" is the closest fit for the context of the day.
  • The correct option is C. celebration.