/*
* BWIDOW.cpp
*
* Created on: Jun 3, 2014
* Author: Arpit Bhayani
*/
#include <cstdio>
#include <cstdlib>
#include <iostream>
using namespace std;
#define DEBUG 0
#define gc getchar
#define ll long long
void scanint(ll int &x) {
register ll int c = gc();
x = 0;
for (; (c < 48 || c > 57); c = gc())
;
for (; c > 47 && c < 58; c = gc()) {
x = (x << 1) + (x << 3) + c - 48;
}
}
int main(int argc, char * argv[]) {
int t;
scanf("%d", &t);
while (t--) {
ll int n, maxi = 0, maxo = 0, index = 0;
scanint(n);
for (ll int i = 0; i < n; i++) {
ll int x, y;
scanint(x);
scanint(y);
if (x > maxi) {
maxi = x;
index = i + 1;
} else if (y > maxo) {
maxo = y;
}
}
if (maxi > maxo) {
cout << index << endl;
} else {
cout << -1 << endl;
}
}
return 0;
}
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