Betting out in an unraised pot

[Roy6]

... is a very interesting question is shorthanded games I believe.

Let's look at this hand:

unknown CO limps, I call with K [img]/images/graemlins/spade.gif[/img] 8 [img]/images/graemlins/club.gif[/img], BB checks

The flop comes 4 [img]/images/graemlins/club.gif[/img] J [img]/images/graemlins/club.gif[/img] 7 [img]/images/graemlins/diamond.gif[/img]

I check, BB bets out. He is 59/14, a very agressive player. He knows that I either bet or fold this flop.
So now, as I've announced that I'll fold, he knows he'll just have to fold out CO to win this pot, this means he'll bet out with air here a lot of times.

What would you bet out with if your were me?
I think I'd bet out with every pair, A [img]/images/graemlins/club.gif[/img] with a kicker>7, any 2 clubs, 56, 98, 68 (?) and maybe 36 if either card is [img]/images/graemlins/club.gif[/img]

What would you bet out with if you were BB and knew SB will fold (as he checked)?

[GTSamIAm]

The CO is in the hand, so I imagine he'll need a little bit of something. He'll probably bet any flush or straight draw, any pair, and any two overcards.