Tick the box next to the correct sentence; note that only one sentence in each group is correct.<font color="#7f7f7f"> </font><br/><br/><br/>1.Andrea has an unusual beautiful voice. <br/><br/>2.Andrea has a unusual beautiful voice. <br/>3.Andrea has a unusually beautiful voice. <br/><br/>4.Andrea has an unusually beautiful voice.<br/><br/>Which one is right?