Gawian wears the green girdle becuase he failed to become a green knight so he wears the girdle to symbolize being part of the green knights.
The third one:
“I can’t wait to be old enough to vote,” said Felipe,
It relates to the actual meaning which is "<span>a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change."</span>
It seems that you have already filled the correct pronoun in the blank provided. Yes, the correct answer to complete this sentence is the pronoun "this". The pronoun "this" is an example of a demonstrative pronoun. Other demonstrative pronouns also include these, those, and that. Hope this answer helps.
