题目内容：

阅读下面短文,从方框中选择恰当的单词,并用其适当形式填空。

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.