Tetris game problem

I'm using AS2 and fps120.
I'm creating a tetris game, but I encountered a problem:
I made a function which makes the block go directly to the bottom on the press of "space".
I used
if(Key.isDown(Key.SPACE)){
But when I pressed space, the blocks stacked up immediately. It's because after I press space, another block apears immediately and goes to the bottom immediately, and keeps going until I release spade. It isn't a problem if I use lower fps, but my fps is 120, which means even I release space as quickly as I could, at least six blocks would stack up. I want to know is there anyway to detect the releasing of "space" or a detection which only detects on the instant I press, instead of when the key is down.

use a boolean:
if(Key.isDown(..)){
if(!alreadyExecuted){
alreadyExecuted=true
if(Key.isUp(..)){
alreadyExecuted=false;

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[url=http://postimg.org/image/pg9rdcjsr/][img]http://s25.postimg.org/pg9rdcjsr/Facebook_page.jpg[/img][/url]
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Your public boolean keyXXX methods don't return a boolean.
And use code tags when posting code. There is a code button above the message editor.

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