Images Continue In The Next Frame

This code goes right but the images (book, pencil...) appears again in the next frame. How can I solve this problem?
Help me!

//drag and drop code//


var startX:Number;
var startY:Number;
var counter:Number = 0;

var soundReq:URLRequest = new URLRequest("woodblock.mp3");
var woodblock:Sound = new Sound();
woodblock.load(soundReq);

pencil_mc.addEventListener(MouseEvent.MOUSE_DOWN, pickUp);
pencil_mc.addEventListener(MouseEvent.MOUSE_UP, dropIt);
schoolbag_mc.addEventListener(MouseEvent.MOUSE_DOW N, pickUp);
schoolbag_mc.addEventListener(MouseEvent.MOUSE_UP, dropIt);
book_mc.addEventListener(MouseEvent.MOUSE_DOWN, pickUp);
book_mc.addEventListener(MouseEvent.MOUSE_UP, dropIt);
notebook_mc.addEventListener(MouseEvent.MOUSE_DOWN , pickUp);
notebook_mc.addEventListener(MouseEvent.MOUSE_UP, dropIt);
student_mc.addEventListener(MouseEvent.MOUSE_DOWN, pickUp);
student_mc.addEventListener(MouseEvent.MOUSE_UP, dropIt);
teacher_mc.addEventListener(MouseEvent.MOUSE_DOWN, pickUp);
teacher_mc.addEventListener(MouseEvent.MOUSE_UP, dropIt);
friends_mc.addEventListener(MouseEvent.MOUSE_DOWN, pickUp);
friends_mc.addEventListener(MouseEvent.MOUSE_UP, dropIt);

function pickUp(event:MouseEvent):void {
event.target.startDrag(false);
reply_txt.text = "";
event.target.parent.addChild(event.target);
startX = event.target.x;
startY = event.target.y;
}
function dropIt(event:MouseEvent):void {
event.target.stopDrag();
var myTargetName:String = "target" + event.target.name;
var myTargetisplayObject = getChildByName(myTargetName);
if (event.target.dropTarget != null && event.target.dropTarget.parent == myTarget){
reply_txt.text = "Good Job!";
event.target.removeEventListener(MouseEvent.MOUSE_ DOWN, pickUp);
event.target.removeEventListener(MouseEvent.MOUSE_ UP, dropIt);
event.target.buttonMode = false;
event.target.x = myTarget.x;
event.target.y = myTarget.y;
counter++;
woodblock.play();
} else {
reply_txt.text = "Try Again!";
event.target.x = startX;
event.target.y = startY;
}
if(counter == 7){
reply_txt.text = "Congrats, you're finished!";
}
}

pencil_mc.buttonMode = true;
schoolbag_mc.buttonMode = true;
book_mc.buttonMode = true;
notebook_mc.buttonMode = true;
student_mc.buttonMode = true;
teacher_mc.buttonMode = true;
friends_mc.buttonMode = true;

stop();

//next page code//

proximo_BT.addEventListener(MouseEvent.CLICK, release1);

function release1(evt:MouseEvent):void {
nextFrame();
}

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