#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint1000000007;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000003

mint get(mint n){
	return n * (n+1) / 2;
}

mint get2(mint n){
	mint r = n;
	r *= n+1;
	r *= 2*n+1;
	r /= 6;
	return r;
	
}

int main() {
	
	int _t;
	cin>>_t;
	
	rep(_,_t){
		long long n,m;
		cin>>n>>m;
		
		mint t = mint(n).pow(m);
		mint ans = get(t);
		ans -= get2(mint(n).pow(m/2));
		cout<<ans.val()<<endl;
	}
	
}