One possible version:

Dear Editor，

A Lining-up Day has been set in Beijing and it helps people enjoy an easier and more harmonious life。 This has set a good example for other cities。 Nowadays， some people are unwilling to line up when they are doing their shopping or waiting for the bus， so I think it is necessary to establish a Lining-up Day to remind them。 In this way， people will form the good habit of lining up voluntarily。 I do hope that we will stick to this practice and popularize it until each day becomes a Lining-up Day。 I’m sure it will make a big difference and our society will become more and more pleasant。

Yours，

Li Hua

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