10NL AK against pressure

[Mihalych]

There aren't reads or stats about villian.

Party Poker No-Limit Hold'em, $0.10 BB (9 handed) Party Poker Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB ($10.30)
BB ($10.82)
UTG ($31.09)
UTG+1 ($10)
MP1 ($10)
Hero ($9.24)
MP3 ($10)
CO ($7.20)
Button ($2.05)

Preflop: Hero is MP2 with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $0.4</font>, <font color="#666666">1 fold</font>, CO calls $0.40, <font color="#666666">3 folds</font>.

Flop: ($0.95) K[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $0.7</font>, <font color="#CC3333">CO raises to $1.4</font>, Hero calls $0.70.

Turn: ($3.75) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, CO calls $7.20 (All-In), Hero...

What is your action in the beginning of turn?
and after his raise?