Multi select dropdown in mvc

Question

<select class=".my-select" chosen="{width:'100%'}" multiple data-placeholder="Recepients"

ng-model="recepients2">

<option ng-repeat="contact in contactBook">{{contact.name}}</option>

</select>

this is my code,binding data from database.

But the first data only binding into the chosen dropdown list.

other data's all not displayed.but in the inspect element its displaying.

Do you have any idea's about this guys?