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我建議你咁講:
I would like to show you my Alien Puppet, his name is "Seven". It is a character from the movie CJ7. In the movie, Stephen Chow has found Seven from a refuse ground. Seven was not hatched when Stephen found him and it looked like a toy ball. Therefore he gave it to his son to play with. Seven later on hatched to a dog-liked alien animal with super natural power. He is cute and kind hearted and saved Stephen's life.
Mum and I went shopping about two months ago at Toys R Us in Tsim Sha Tsui. I saw Seven and asked mum to buy it for me. Mum agreed and said it was a prize because I had good results from my Mathematics test. She paid one hundred dollars for it.