Subject Verb Agreement: I'm confused to use singular and plural verbs in the following sentence:
1. Studying late at night is one of those things that make / makes me tired.
2.Faurk is one of my friends who is / are doing job in bank.
3. Fuchka is one of my favorite foods that is / are cheap.
I'm having hard time using the correct verbs. say, in the 3rd sentence, I don't know whether it is "is" or "are". I understand that in the sentence "that" should refer to "favorite foods". in this sense, I should use "are". but I'm talking about "Fuchka" here and nor are all my favorite foods cheap.
Please explain the correct answer.