1. Do you mind my asking you 2, I insist on doing it now, not tomorrow 3.The lecturer began speaking on gas exchange in the lungs 4.It’s no use trying it again 5.He stopped doing laboratory experiments on blood coagulation6.The lever of hemoglobin in your blood needs counting 7.Most of us dislike the idea of being examined 8.We had no difficulty in learning the blood formula 9.Please go on speaking on the topic 10.I can't help visiting my sister, who is ill 11.The students made much progress in Physiology by learning this material