Hand converted with online PokerStrategy.com hand converter:
$0.05/$0.1 No-Limit Hold'em (2 handed)
Known players:
[tg]SB$10.00:///////;BB (Hero)$14.62:///////;[/tg]
Preflop: Hero is BB with A:s, K:h.
Hero raises to $0.30, SB calls $0.20.
Flop: ($0.6) K:d, 7:s, 2:c (2 players)
SB checks, Hero bets $0.40, SB calls $0.40.
Turn: ($1.4) 9:c (2 players)
SB checks, Hero checks.
River: ($1.4) 4:h (2 players)
SB bets $1.70, Hero???.
OP: 
how should i play flop/turn/river?