using System;
using System.Collections.Generic;
using System.Linq;

public class Test
{
	public static void Main()
	{
		var data = new Dictionary<string,string>{
            {"question1", "7"},
            {"question1_comment", "pretty difficult"},
            {"question2", "9"},
            {"question2_comment", ""},
            {"question3", "5"},
            {"question3_comment", "Never on time"},
		};
		var res = data
		    .Keys
		    .Where(s => !s.EndsWith("_comment"))
		    .Select(s => new[] {s, data[s], data[s+"_comment"]})
		    .ToList();
		foreach(var a in res) {
			Console.WriteLine(string.Join(", ", a.Select(s => string.Format("'{0}'", s)).ToArray()));
		}
	}
}