There was once a guy who suffered from a cancer, one that can't be cured. He was 18 years old and he could die anytime. All his life, he____(stick) in his house taken care of by his mother.  He never went outside but he was tired____staying at home and wanted to go out for once. So he asked his mother and she gave him____(permit)

    He walked down his block and____(find) a lot of stores. He passed a CD store and looked through____front door for a second. He stopped and saw a beautiful girl about his age. He opened the door and walked in, not looking at anything else but her.

    He walked____(close) until he was finally at the front desk____she sat. She looked up and smiled, “Can I help you?” He said, “I would like to buy a CD.” He picked one out and gave her the money for it. “Would you like me to wrap it for you?” She asked____(smile) again. He nodded and she went to the back. She came back with the wrapped CD and gave it to him. After that, he often bought a CD there. One day, he went there buying a CD____he did every day, and once again she went to the back of the store came back with it____wrap). He took it and when she wasn't looking, he left his phone number on the desk and ran out…

质量均匀分布的光滑球体C静止在如图所示的台阶和竖直墙壁之间，试画出球体C的受力示意图（O为球心）．

课内阅读。

小鸭子正在水里捉鱼，忽然，听见小公鸡喊救命。他飞快地游到小公鸡身边，让小公鸡坐在自己的背上。小公鸡上了岸，笑着对小鸭子说：“鸭子哥哥，谢谢你。”