在探究“杠杆的平衡条件”实验中，所用的实验器材有杠杆尺、支架、细线、质量相同的钩码若干．

   How old was I? I can’t remember. Maybe I was only 10. It was the first 1 without my father because he was away for something. He left me to fill that sad place in my mother’s heart. It was the Christmas when I stopped being a 2 and tried to play Father Christmas myself. I really wanted to make it happy and bright again. It was the Christmas of the 3.
   Mom first saw the coat at Tobias, a nice 4 shop in our town’s little shopping mall. It was dark green. And it was a 5, heavy, wool dress coat. Mom pulled it out from the rack(架) and held it up. “Long enough,” she said in a low voice and 6.
“I need a new coat,” Mom smiled before the mirror. She looked good on any clothes, 7  this coat suited her much better. She looked at the 8, then hung the coat back on the rack, standing there once more to 9
   Eighty-seven dollars. But I decided to buy it for her. As we moved on 10 the mall, I found some excuse to return and asked one of the Tobias ladies to 11 the coat.
   I helped clean every yard(庭院) in our neighbourhood—some yards twice, and soon I got the coat. The store ladies helped me put it in their biggest 12 with bright blue paper and thick silver ribbon(丝带). I don’t remember 13 I got it home, but I can still feel the wonderful 14 and pride that filled me. I would imagine the big space which the box would take up under our tree. Here it was—joy, peace and15 —all in the box, waiting for Mom’s surprise