, Mr. Green managed to get the important ceremony even if the time is so limited.

  , the little dog will hide away under the bed.

 With after-class activities most of her time, she couldn't her study, which was for the failure in the exams.

  the disposal of categorizing(分类) rubbish beneficial to the protection of environment, but also it will to saving natural resources.

 The skin is an essential part of your body and its largest organ. You have three layers of skin ① . The functions of your skin are also very complex: it keeps you warm or cool; it prevents your body from losing too much water; it is ② . So as you can imagine, if your skin get burned it can be very serious. First aid is a very important first step in the treatment of burns.