题目内容：

 

I had a very unusual experience on1.星期天。At around ten   o'clock in the morning, I was walking down the street when a UFO landed in 2.f_____ of me. You can imagine how 3.奇怪的it was! An alien got out and walked down the Center Street. I 4.跟随it to see where it was going, and I was very surprised when it went into a souvenir shop. While it was looking at the souvenirs, the assistant called the 5.p_______.