Set Default Values with ngModel Property Binding in Angular Template-driven forms

app.component.html
<div class="container">
  <div class="row">
    <div class="col-xs-12 col-sm-10 col-md-8 col-sm-offset-1 col-md-offset-2">
      <form (ngSubmit)="onSubmit()" #myForm="ngForm">
        <div id="user-data">
          <div class="form-group">
            <label for="username">Username</label>
            <input type="text" id="username" class="form-control"
                   ngModel name="username"
                   required>
          </div>
          <button class="btn btn-default" type="button">Suggest an Username</button>
          <div class="form-group">
            <label for="email">Mail</label>
            <input type="email" id="email" class="form-control"
                   ngModel name="email"
                   required email
                   #myEmail="ngModel">
            <span class="help-block" *ngIf="!myEmail.valid && myEmail.touched">Please enter a valid email!</span>
          </div>
        </div>
        <div class="form-group">
          <label for="secret">Secret Questions</label>
          <select id="secret" class="form-control"
                  [ngModel]="'pet'"
                  name="secret">
            <option value="pet">Your first Pet?</option>
            <option value="teacher">Your first teacher?</option>
          </select>
        </div>
        <button class="btn btn-primary" type="submit"
                [disabled]="!myForm.valid">Submit
        </button>
      </form>
    </div>
  </div>
</div>
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