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


int main()
{
    int t;cin>>t;
	while(t--)
	{
		int x;cin>>x;

		if(x%2!=0)
		{
			cout<<-1<<endl;
		}
		else
		{
			int a[x];
			for(int i = 0;i <= (x/2-1);i++ )
			{

				a[i] = 1;
			}

			for(int i = x/2;i <= x-1;i++ )
			{

				a[i] = 0;
			}

			for(int i = 0;i <= x-1;i++ )
			{

				cout<<a[i];
			}
		}
	}
    return 0;
}