music: 80's Chart Toppers: Name The Artist: Breakdance?

Questions

outside which building was john lennon shot?

on which label did johnny mathis begin recording?

joseph and etienne montigolfier, inventers of the hot air balloon, first believed that their balloon didn't rise due to hot air but an invisible gas given off by fire. what did they name this gas?

knife, clown and pencil are types of ______?

laetrile is associated with the pit of which fruit?