“一江春水向东流”反映了我国地势特点（　　）

电热水袋中的水加热后袋子膨胀，是因为袋内的水（   ）

  根据句意及首字母提示完成单词

（1）My little brother runs so f____ that I can't catch up with him.

（2）I want to be the PE m____ in our class.

（3）As your good friend, I p____ to help you.

（4）Every day I run to the school and it can keep me f____.

（5） —Is e____ here today?  —Yes, we are.