完形填空，通讀下面的短文，掌握其大意，然后從每小題所給的A，B，C三個選項中選出一個最佳答案。

I had a very unusual experience(經歷)on Sunday．At ten in the morning, I was 　　1　　 down the street when a UFO landed right 　　2　　 of me．You can imagine(想象) 　　3　　 strange it was! An alien 　　4　　 and walked down Center Street．I followed it to see 　　5　　 it was going, and I was very surprised when it went 　　6　　 a souvenir shop．While it was 　　7　　 at the souvenirs(紀念品), the shop assistant called the 　　8　　．Before the police arrived, the alien left the 　　9　　 and then visited the Museum of Flight．　　10　　 the alien was in the museum, I called the TV station．Isn't that amazing!

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