阅读下面的短文，然后根据汉语或英语首字母提示写出所缺英语单词的正确形式。
I had a very unusual experience on星期天。At around ten   o’clock in the morning, I was walking down the street when a UFO landed in f_____ of me. You can imagine how奇怪的it was! An alien got out and walked down the Center Street. I 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 p_______.