A $10-$20 game. You are in the big blind holding the 9

-6

and get a free play after three early players limp, a middle player limps, and the small blind limps. There is $60 in the pot and six players. The flop is: T

-7

-3

, giving you a gutshot straight-draw. The small blind checks. You check. The first early player bets and everyone calls back to you. What do you do?