My classmates talked about the winter camp. Everyone was happy except (除……之外) me. I didn't ____to go skiing (滑雪) at all. I wanted to stay at home but my parents asked me to go.

    When arriving at the camp our coach (教练) asked us to ski I thought I skied ____

than others but I still didn't do a good job. Ha, Ha! behind me，someone started ____

 I looked back ____who was laughing at me. To my surprise, I saw a girl. She did as ____as me. "I thought I'd be bad at this, but it seems ____than I expected!" she said.

    The next day I didn't want ____ skiing. But my coach chose me to be the first one to ski down the slope (斜坡).This time I ____I was flying and it was wonderful. After that I wasn't afraid anymore. And I didn't ____what other people thought of me. That day my coach said I skied the most beautifully of all.

    From this I learned that we should try our best ____every challenge (挑战).

____

I have nineteen apples．

在一个体积为5L的真空密闭容器中加入1.25molCaCO₃，发生反应CaCO₃（s）⇌CaO （s）+CO₂（g），测得平衡时二氧化碳的物质的量浓度随温度的变化关系如图1所示．请按要求回答下列问题：

（1）该反应正反应为____ 热反应（填“吸”或“放”），温度为T₅℃时，该反应耗时40s达到平衡，则T₅℃时，列式计算该反应的反应速率为____ mol/（L•s）　．

（2）T₂℃时，该反应已经达到平衡，下列措施中能使该反应的平衡常数K值变大的是____ （选填编号）．

a．减小压强       b．减少CaO的量     c．加入CaCO₃     d．升高温度

（3）请在图2中画出平衡常数K随温度的变化曲线．

（4）在T₅℃下，维持温度和容器体积不变，向上述平衡体系中再充入1molN₂，则最后平衡时容器中的CaCO₃的质量为____ g．