The words in each set have a common connection, something that bonds all three of them in some way, shared features or characteristics...a manifestation of common attributes.
Can you find a Commonality?
= 1. BELLY; BREAK; BALLET
= 2. HERO; SUBMARINE; HAM & CHEESE
= 3. CONCENTRATION; PERFECTION; OPERATION
4. THE COFFEE URN; THE DUMB-WAITER; THE SEVEN DAY CLOCK
= 5. A JELLY FISH; A SQUID; A COWARD
= 6. THE MOUSE THAT ROARED; DR STRANGELOVE; THE PINK PANTHER
7. PILE DRIVER; SLEEPER; SUPLEX
= 8. A STEER; A WETHER; A GELDING
= 9. FISHING; FINISH; DOTTED
= 10. ERROL FLYNN; SEAN CONNERY; KEVIN COSTNER