One possible version:

Dear Editor，

The students in our school had a heated discussion about whether a subway should be built in our city。 We have different opinions about this topic。

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About 60 percent of the students are in favor of the plan。 They hold the view that building a subway has such advantages as convenience， speed and safety。 Besides， it is energy-saving and free from pollution。 What’s more， it could help reduce the traffic jams and accidents above ground。

The rest of the students hold the opposite opinion。 They think building a subway is a waste of money which could be used to build more roads and railways。 Worse still， it could damage some historical relics under ground。

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Personally I think the advantages overweigh the disadvantages。 Therefore， I would like the subway to be built。