using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = NN;
        var ans = new string[t];
        for (var u = 0; u < t; ++u)
        {
            var n = NN;
            if (n % 4 == 1 || n % 4 == 2) ans[u] = "-1";
            else if (n % 4 == 0)
            {
                var ch = Enumerable.Repeat('1', n).ToArray();
                for (var i = 0; i * 4 < n; ++i)
                {
                    ch[i] = '0';
                    ch[n - i - 1] = '0';
                }
                ans[u] = string.Concat(ch);
            }
            else
            {
                var ch = Enumerable.Repeat('1', n).ToArray();
                for (var i = 0; i < (n + 1) / 4; ++i)
                {
                    ch[i] = '0';
                    ch[n - i - 2] = '0';
                }
                ans[u] = string.Concat(ch);
            }
        }
        WriteLine(string.Join("\n", ans));
    }
}