719 Did You Excavate Their Spring? 4yr

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The silence didn't last long. Yuan Zhou hadn't opened the book when Chu Xiao suddenly spoke.
"Why didn't you speak last time?" Chu Xiao said all of a sudden without any sense.
But Yuan Zhou understood him immediately. He said calmly, "It cost me nothing to answer the phone."
Yuan Zhou said that so straightforwardly that even Chu Xiao became stupefied and answered, "It costs me nothing to make the call, too."
"According to my phone package, the telecommunication company will offer me one more hour of chatting time as long as I spend no less than 40 Euro every month. Coincidentally, I still have one hour of talk time left," Chu Xiao paused for an instant and then continued, "It doesn't cost me anything, either."
"Um," Yuan Zhou answered vaguely and simply and didn't say anything else.
"Goodbye," said Chu Xiao abruptly.
"Bye." This time, Yuan Zhou still waited for Chu Xiao to hang up the phone first.
Yuan Zhou indicated that he would like to offer help to Chu Xiao to consume