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How to end a conversation politely？
Reasons	You may have to do something else. You may have（1） more to say，so you just want to keep the conversation short.
Ways	If you（2） know that person，you can just say， "I need to go now." You may also give a reason，like "I really need to go because my piano class will（3） in ten minutes." If you just meet someone in a social（4） ，you can say， "It was nice to meet you.Maybe we can talk happily sometime later." If you see someone who is not patient and wants to（5） ，you can say， "Well，I'm sure you have a lot to do today."