#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int N, t;
string T;

int main(void){
  cin >> t;
  for (int i = 0; i < t; i++) {
    cin >> N;
    T = "";
    if (N % 4 == 0 || N % 4 == 3) {
      for (int j = 1; j <= N; j++) {
        if (N % 4 == 0) {
          if (j % 4 == 0 || j % 4 == 1) T += '0';
          else T += '1';
        } else {
          if (j % 4 == 0 || j % 4 == 3) T += '0';
          else T += '1';
        }
      }
      cout << T << endl;
    } else {
      cout << -1 << endl;
    }
  }
  return 0;
}