Betting the turn with middle pair

[Jonathan]

Hi all,

Here is an interesting hand. I raise preflop with 99
and get 2 callers. An overcard comes on the flop, I bet and
get called by 1. Should I bet the flop or check?
I fear the queen and check hoping for a free card. On the river opponent bets. Who folds this?

Thanks,
Jonathan
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Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (9 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

<font color="#C00000">CO (t1730)</font>
Button (t885)
SB (t785)
<font color="#C00000">Hero (t800)</font>
UTG (t740)
UTG+1 (t655)
MP1 (t915)
MP2 (t730)
MP3 (t760)

Preflop: Hero is BB with 9[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/spade.gif[/img].
<font color="#666666">4 folds</font>, MP3 calls t15, CO calls t15, Button calls t15, SB completes, <font color="#CC3333">Hero raises to t80</font>, MP3 calls t65, CO calls t65, Button folds, SB folds.

Flop: (t267.50) 4[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets t225</font>, MP3 folds, CO calls t225.

Turn: (t717.50) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, CO checks.

River: (t717.50) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets t275</font>, Hero calls t275.

Final Pot: t1267.50