what word links these: centre, certificate, record?

Questions

Moronic Duo 1: What was on the blackboard that B&B couldn't read after a doctor's visit?

Mostly Classic Movies: Choreographed ultra-violence; 1971 Best Picture Oscar?

Mostly Classic Movies: Gene Kelly, Donald O'Connor, Debbie Reynolds: "greatest movie musical"?

Mostly Classic Movies: Its director wanted to make an "unwatchable" film. To most people, it is.?

Mostly Classic Movies: What good is sitting/alone in your room Come! Hear the music play!?