阅读下面短文，根据短文内容用方框内所给词语的适当形式填空，使短文语义完整。（10分）
to，must，ask，unusual，it，when，early，who，notice，if
My name is Jim White. I live in America. I had a very 1 experience on Sunday. I saw a UFO in the daytime. 2 this spring, I went outside with my friend Bill 3 lived close to me. We were walking to a hill 4 I saw a large bright light dancing in the sky. I called Jim and asked him to look up. He kept 5 , “What is that?” “A UFO!” I shouted excitedly. I 6 it was round and red in the center.
After we looked at 7 for a moment, we found it seemed that it had wings, but it was still round. Bill would not believe me when I told him it 8 be a UFO. We shouted 9 it and we wished that it would land. We wanted to know 10 there was an alien in it. But soon it disappeared. I guessed we scared it off.
Do you believe me? It’s a true story.unusually
网友回答
(答案→)unusually
解析：这篇短文中作者详细的描述了自己的一次在白天看到飞碟的经历。
【小题1】联系下文，我在白天看到了飞碟，可知我体验了一次不同寻常的经历，结合所给选项可知填形容词unusually，不同寻常的。
【小题2】联系下文，可知指的是今年春天早些时候，故填副词Early，在初期。
【小题3】考查定语从句。本句中先行词my friend Bill 为下文从句的逻辑主语，故指人的引导词用who，谁。
【小题4】联系上下文，可知句意为：当我们看到一团大而明亮的光团在天空闪的时候，我们正在上山。结合所给选项可知填when，当……时。
【小题5】联系下文，可知句意为：他不断地问。现在分词作宾语表示反复的，抽象的动作，结合所给选项可知填动名词asking，问。
【小题6】联系下文及所给单词，可知指的是我注意到他的中心是圆的红色的。结合语境可知本句描述的是过去的动作，故用一般过去时态。填notice的过去式noticed，注意到。
【小题7】联系上文，可知此处指的是飞碟，故用人称代词it，它。
【小题8】联系上文，可知我告诉他这肯定是飞碟，结合所给选项，可知填情态动词must，必须，一定。
【小题9】结合语境可知我们对着它喊，故填介词to，对，向。
【小题10】联系下文，可知我想知道里面是否有外星人。故填连词if，是否。