1) I have no idea. Is it "okay"?
2) They are very funny.
3) He made promises for big things.
4) There is no opposite to "hang up." You pick up the phone, you dial, you talk, then at the end of the call, you hang up.
5) I'm sorry, Luiz, but I'm not sure what you mean by the person who makes the birthday. Can you try to explain in other words?