请你代表你班同学给校长写一封信，反映一下你校食堂的几点问题，以引起学校重视，并针对问题提出2条合理建议。
菜价昂贵，菜式单一
排队时间长，浪费午休时间
味道不佳，浪费现象严重
提示词：食堂 canteen
Dear Principal,
Recently, many students are discussing the problems of the canteen.
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I sincerely hope you can adopt my suggestions. Thank you!
Yours,
Li Hua