How do I place two selections side-by-side using Bootstrap?

I want to place two select options side by side in my form. I am using Bootstrap 3, but I am unable to place them with correct alignment.

Here is my HTML code:

    <form role="form">
        <div class="form-group">
            <div class="input-group date" id="datetimepicker1">
                <input type="text" class="form-control"/>
                <span class="input-group-addon"><span class="fa fa-calendar"></span></span>
            </div>
        </div>
        <div class="form-group">
            <div class="input-group">
                <input type="text" class="form-control"/>
                <span class="input-group-addon"><span class="fa fa-calendar"></span></span>
            </div>
        </div>
        <div class="form-group">
            <select class="form-control">
                <option>1</option>
                <option>2</option>
                <option>3</option>
            </select>
        </div>
        <div class="form-group">
            <select class="form-control">
                <option>1</option>
                <option>2</option>
                <option>3</option>
            </select>
        </div>
        <button type="submit" class="btn btn-primary btn-block te" >Prices &amp; Availability</button>
    </form>