#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    if (n % 4 == 0 || n % 4 == 3) {
      string ans = "";
      for (int i = 1; i <= n; i++) {
        if (i % 4 == (n % 4) || i % 4 == ((n % 4) + 1) % 4) {
          ans += "1";
        }
        else {
          ans += "0";
        }
      }
      cout << ans << endl;
    }
    else {
      cout << -1 << endl;
    }
  }
  return 0;
}