阅读下面的短文，在标有序号的空白处填入一个适当的词或用括号中词的适当形式填空。

The skin is  小题1:    essential part of your body and its largest organ. You have three

 l 小题2:   of skin which act as a barrier　小题3:　disease , poisons and the sun’s harmful rays. The functions of your skin are also very 小题4:　: it keeps you warm or cool; it小题5:　your body from losing too much water; it is __小题6:__ you feel cold , heat or pain and it gives you your 小题7:　of touch. So as you can imagine, if your skin gets _小题8:__  it can be very serious. First aid is a very important 小题9:　step in the treatment of burns . You can get burned by a variety of things. There are three types of burns, 小题10: (depend) on which layers of the skin are burned.