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Jack was in the park with his grandmother，Mrs．Watson．"I can hear music，"she said．"Do you know where it （91）　　from？""It's the ring on my mobile phone，"said Jack．"Are you going to answer it？"asked Mrs．Watson．"No"，replied Jack．"Whoever it is can leave a message on my voicemail，and I（92）　　them back later．"

Mrs．Watson had never used a mobile phone，and was intersted to know how it （93）　　，so Jack took his out of his pocket（94）　　her．"You use it just like a common telephone，"he said．"But you can make phone calls when you are out of the house．And mobile phones can （95）　　other things．For example，you can use it to do shopping online or use the GPS to guide you home whenever you are lost．"