Considering language use in the text, it’s correct to say:
The relative pronoun “who” (l. 8) can be suitably replaced by whom.
The word “Better” (l. 12) is the comparative form of good.
The adjective “high” (l. 18) is the opposite of big.
The demonstrative “those” (l. 27) is in the singular form.
The conjunction “However” (l. 30) expresses result.