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。

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。