16. According to the passage, Guo’s students can keep their homework on WeChat, can’t they?

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　　17. How can the QR codes be sent to Mr. Guo?

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　　18. What is one of the advantages of the new way of handing in homework?

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　　19. What do some parents worry about?

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　　20. What do you think of the new way of handing in homework?

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