阅读下列短文，然后从每小题所给的A、B、C三个选项中选出最佳答案。

    I had very unusual experience 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 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!