阅读对话,判断下列句子正误
Mark: Hi, Alice! Would you like to have a picnic?
Alice: Sure. Are you free(空闲) on Monday?
Mark: No, I'm busy. I go to the library on Monday. What about Tuesday?
Alice: No. I play the piano on Tuesday. I'm free on Monday, Thursday and Friday.
Mark: I'm free on Friday.
Alice: OK! Let's have a picnic on Friday.