Time is very important in our life. But it never had any importance in my life until I 1a watch from my father. It 2 me the importance of time in my life.

    I got this gift on a gray-sky day. I had to go to the 3 to pick up (接)my uncle Ali. However，I forgot it 4 I was playing with my friends. Later I  5 my uncle， but I was late for him. He had to 6 a taxi to my father's house.

    I got to my father's house 7. My father looked at me angrily. I said “Hi” to him and my 8 uncle. My father asked me to sit 9 him and gave me this watch which was a gift from 10. It was made of silver. Then he said，“Essa, did you have fun 11  your friends today? What you did was not very nice and you should be sorry for your 12 This watch will be a reminder（提醒物） for you. I hope today you have learned something  13 . ”

    I learned a lesson from my father: respect (尊重) time and 14 be late. The watch is important to me, not because of its 15 but because of the lesson（教训） that I learned from it.

小明在探究“光反射时的规律”时将一块平面镜放在水平桌面上，再把一张纸板放置在平面镜上．

如图所示，用滑轮组把一个物体匀速拉起，不计摩擦，则下列 说法中正确的是（  ）