Dan Parks scored a try against Argentina
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Dan Parks believes Scotland lack the killer instinct to transform narrow defeats into victories.
Argentina edged the Scots 23-19 at Murrayfield despite the hosts leading for three quarters of the game.
Stand-off Parks said: "We had the chances, but we just didn't take them. We did a lot of good things, but we just fell short. It was disappointing.
"We just didn't go on and get the tries to put the game to bed. We need to be more patient with the ball."
Scotland's next challenge is tough-tackling Samoa, ahead of the far more daunting challenge of New Zealand.
"We didn't get the win against Argentina, but next week we'll be up for it," added Parks, who scored Scotland's only try and also contributed a drop goal.
"The belief is good and we can go forward from here.
"Everyone is looking forward to the games.
"We prepared really well and showed a lot of good things against Argentina."