Indicate all the pronouns (they, them, you, he, his, her, you, it, etc.) present in the given sentence. If there are multiple such pronouns in a sentence, then list them in the order of their first appearance in the given sentence. If a pronoun appears multiple times in a sentence, list it only once.

the drain is clogged with hair. it has to be removed.
it

bob paid for charlie's college education, but now charlie acts as though it never happened. he is very hurt.
it, he

mark told pete many lies about himself, which pete included in his book. he should have been more skeptical.

himself, his, he