# include <bits/stdc++.h>
using namespace std;
int t;
int n;
const int N = 110;
int a[N];
int main() {
	cin >> t;
	while (t--) {
		scanf("%d", &n);
		for (int i = 1; i <= n; i++) {
			scanf("%d ", &a[i]);
		}
		int flag = 0;
		for (int i = 2; i <= n; i++) {
			if (a[i-1] >= a[i] && a[i] != 0) {
				flag = 1;
				break;
			} else {
				a[i] = a[i-1] + a[i];
			}
		}
		if (flag == 1) {
			printf("%d\n", -1);
		} else {
			for (int i = 1; i <= n; i++) {
				printf("%d ", a[i]);
			}
			printf("\n");
		}
	}
		
	return 0;
}