Answer: the answer is unless.
Explanation:
4️⃣Jane did not fill her car up with petrol before she left, <u>that</u> was careless of her.
5️⃣ They always give the available seats to <u>whoever</u> comes first.
6️⃣ A home computer <u>provides</u> an opportunity for convenient and efficient work at home.
7️⃣ Near the White House is another famous landmark <u>called</u> the Washington Monument.
8️⃣ There was a small room into <u>that</u> we all crowded.
9️⃣ I received two job offers, <u>neith</u><u>er </u><u>of </u><u>which</u> I accepted.
1️⃣0️⃣ I have three brothers, <u>two </u><u>of </u><u>them</u> are professional athletes.

He does not believe that people can change for the better. He is in general known as someone who makes fun of those sentimental humanitarian ideals, and is usually realistic about human behavior. Even when he tries being a sentimentalist and when you think someone is going to do something positive, it usually backfires and something bad happens.
The answer is the second one this was so easy lol but tell me if I am wrong
C ............ ..........