下面说法中 ①﹣a一定是负数；②0.5πab是二次单项式；③倒数等于它本身的数是±1；④若|a|=﹣a，则a＜0；⑤由﹣2（x﹣4）=2变形为x﹣4=﹣1，其中正确的个数是（　　）

单词拼写
(1)I called you last night but you didn't answer me. What was h____ .
(2)I looked for my cat e____ , but I didn't find it.
(3)He is good at math, but he failed the exam this time. I can not i____  how strange it is.
(4)Both Tom and Tim have t____ to the ball game. They’ll go and watch it.
(5)Liu Yang becomes a national h____  because she is the first Chinese woman that has been to the space.
(6)Lily m____  her English teacher while she was shopping in the mall.
(7)There are still lots of p____  families in China. We should help them.
(8)This problem is too s____ . Even a kid can work it out.
(9)I had a car accident yesterday. L____ , there was nothing wrong with me.
(10)Do you make the bed for your parents?  No, they make the bed by t____ .

俗话说“人往高处走，水往低处流”，而植物体却能把根吸收的水分运达数米高的顶部．水分向上运输的动力主要来自植物的（　　）