#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define ll long long
#define ull unsigned long long
#define nl '\n'
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define rall(s)  s.rbegin(), s.rend()
#define getline(s) getline(cin>>ws,s)
#define ceill(n, m) (((n) / (m)) + ((n) % (m) ? 1 : 0))
#define pi  3.141592653589793
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define multi_ordered_set tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>


void Fast_IO(){
ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
// freopen("filename.in", "r", stdin);
// freopen("filename.txt", "w", stdout);
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
#endif
}

int x[8] = { 2, 1, -1, -2, -2, -1, 1, 2 };
int y[8] = { 1, 2, 2, 1, -1, -2, -2, -1 };




void solve(){
ll n; cin>>n;
vector<ll> v(n),ans1(n),ans2(n);
for(int i=0;i<n;i++) cin>>v[i];
ans1[0] = ans2[0] = v[0];
for(int i=1; i<n; i++){
    ans1[i] = v[i] + ans1[i-1];
    ans2[i] = ans2[i-1] - v[i];
    ans2[i] = ans2[i] <0? ans1[i]:ans2[i];
}
if(ans1 != ans2) cout<<"-1";
else for(auto &i:ans1) cout<<i<<" ";
cout<<nl;


}

int main(){
    Fast_IO();
int t =1;
cin>>t;
while(t--){
solve();
}
return 0;
}