阅读下面短文，根据上下文意义和所给单词首字母，写出标有题号的每小题空白处适当单词的完全、正确形式。(每空一词)

    When I was l3 years old，a boy gave me an important gift．It was a s  1  ．

    It was the early autumn of my first year at a junior high school，and my old school was far away．As a result，no one k 2     who I was．I was very lonely，and afraid to make friends with a 3     ．

Every time I heard the other students talking and l 4   ，I felt my heart break．I couldn’t talk to anyone about my problem，and I didn’t want my parents to w 5     about me．

    Then one day，my classmates talked happily with their friends，but I sat at my desk unhappily as u 6   ．At that moment，a boy e 7     the classroom．I didn’t know who he was．He p 8    me and then turned back．He looked at me and，without a w  9    ，smiled．

    Suddenly，I felt the touch of something bright and friendly．It m 10     me feel happy，lively and warm．

    That smile c 11   my life．I started to talk with the other students and made friends．

    Day by day，I became more active and c 12     to everyone in my class．The boy with the lucky smile has become my best friend now．

    One day，I asked him w 13     he smiled，but he couldn’t remember smiling at me!

    It doesn’t matter even if he didn’t tell me the reason．because all the dark days have gone．Now I believe that the world is w l4    you think it is．If you think you are lonely，you might always be a 15   ．So smile at the world and it will smile back．

1．smile        2．knew      3．anyone／anybody    4．1aughing    5．worry

6．usual        7．entered    8．passed    9．word    10．made

11．changed    12．closer    13．why      14．what    15．alone