Let's pretend you're Hero. I'm Villain, and a complete unknown to you. It's my very first hand at the table.

Party Poker No-Limit Hold'em, $ Hero (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

Hero is UTG ($100.05)
MP ($294.64)
Button ($103.65)
SB ($101.65)
Villain is BB ($100)

Preflop: Hero is UTG with A, Q. SB posts a blind of $0.50.
Hero raises to $4, 3 folds, Villain raises to $12, Hero calls $8.

Flop: ($24.50) 7, 9, Q (2 players)
Villain bets $20, Hero calls $20.

Turn: ($64.50) 7 (2 players)
Villain bets $68 (All-In), Hero ???