OK, I'm convinced, call flop/reevaluate on turn is a better line.

OK, so what is our response to each of the following?

a) Turn is a heart, villain checks
b) Turn is a heart, villain bets
c) Turn is a blank, villain bets
d) Turn is a blank, villain checks

d is an obvious bet, I think c is a raise, but what about a and b?