Two people perished "," "," the spot during the landslide.

Here are the solutions to the questions:

23. Two people perished on the spot during the mudslide.
The phrase "on the spot" means immediately or at the exact location.

• The correct option is B. $$\boxed{\text{B. on}}$$

24. The girl's uniform is too big.
The apostrophe 's' indicates possession, meaning the uniform belongs to one girl.

• The correct option is C. $$\boxed{\text{C. girl's}}$$

25. This is the man whose son won the prize.
"Whose" is a possessive relative pronoun, indicating that the son belongs to the man.

• The correct option is D. $$\boxed{\text{D. whose}}$$

26. John is not my friend, is he?
This is a tag question. Since the main clause is negative ("is not"), the tag must be positive ("is he").

• The correct option is A. $$\boxed{\text{A. is he}}$$

27. Joy was absent yesterday, wasn't she?
This is a tag question. Since the main clause is positive ("was"), the tag must be negative ("wasn't she").

• The correct option is D. $$\boxed{\text{D. wasn't she}}$$

28. No one should exalt himself.
The word "exalt" means to praise highly or elevate. The opposite is to humble oneself.

• The correct option is D. $$\boxed{\text{D. humble}}$$

29. Everyone knows that Musa is a generous man.
The word "generous" means willing to give freely. The opposite is "stingy," meaning unwilling to spend or give.

• The correct option is C. $$\boxed{\text{C. stingy}}$$

30. Kanu looks lazier this morning than yesterday.
The word "lazier" means less energetic or unwilling to work. The opposite is "more energetic."

• The correct option is A. $$\boxed{\text{A. more energetic}}$$

31. The literary device that refers to sound is onomatopoeia.

• Onomatopoeia is the formation of a word from a sound associated with what is named (e.g., cuckoo, sizzle).
• The correct option is C. $$\boxed{\text{C. onomatopoeia}}$$

32. A character in a play that opposes the hero/heroine is the antagonist.

• The antagonist is the character who stands in opposition to the protagonist (the main character).
• The correct option is D. $$\boxed{\text{D. antagonist}}$$

33. The technique used to recall past events is flashback.

• A flashback is a scene in a movie, novel, etc., set in a time earlier than the main story.
• The correct option is A. $$\boxed{\text{A. flashback}}$$

34. A writing on a tomb in memory of someone is an epitaph.

• An epitaph is a phrase or statement written in memory of a person who has died, especially as an inscription on a tombstone.
• The correct option is C. $$\boxed{\text{C. epitaph}}$$