Are these sentences correct:<br/><br/><span style="color:#ff0000;">1) Your body is something which you have the duty to take care of.</span><br/><span style="color:#ff0000;">2) Your body is something which you have the duty of taking care of.</span><br/><br/><span style="color:#ff0000;">3) Your body is something of which you have the duty to take care.</span><br/><span style="color:#ff0000;">4) Your body is something of which you have the duty of taking care.</span><br/><br/>Gratefully,<br/>Navi.