Is there a way to tell whether they made a straight?

[Guojing]

I will like to get some advice from anyone whether I could have played this hand better. I flopped 2 pair and keep making pot sized bets on the flop and the turn but the villian keeps calling.

By the river, could I have played it better? I guess I could have just checked but given that his stack is very low, how could I not pay him off if he goes all-in? Any advice on how to play this hand better would be much appreciated.

Prima Poker skin
No Limit Holdem Ring game
Blinds: $0.02/$0.05
10 players
Converter

Stack sizes:
UTG: $9.85
UTG+1: $4.15
UTG+2: $1.01
MP1: $2.49
MP2: $3.78
MP3: $3.53
CO: $5.58
Button: $4.57
SB: $5.17
Hero: $5.10

Pre-flop: (10 players) Hero is BB with J[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
3 folds, MP1 calls, 2 folds, CO calls, SB calls, Hero checks.

Flop: J[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/heart.gif[/img] ($0.2, 5 players)
SB checks, <font color="#cc0000">Hero bets $0.2</font>, MP1 calls.

Turn: 4[img]/images/graemlins/diamond.gif[/img] ($0.6, 3 players)
<font color="#cc0000">Hero bets $0.6</font>, MP1 calls.

River: A[img]/images/graemlins/club.gif[/img] ($1.8, 3 players)
<font color="#cc0000">Hero bets $0.9</font>, <font color="#cc0000">MP1 raises all-in $1.64</font>, Hero calls.

Results:
Final pot: $5.08
<font color="#ffffff">MP1 shows 10h Qs</font>