#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)


const i64 INF = 1001001001001001001;
using modint = atcoder::static_modint<1000000007>;



int main(){
    int T; cin >> T;
    rep(t,T){
        i64 N, M; cin >> N >> M;
        modint allNM = modint(N).pow(M);
        modint halfNM = modint(N).pow(M/2);
        modint ans = allNM * (allNM + 1) / 2;
        ans -= halfNM * (halfNM + 1) * (2 * halfNM + 1) / 6;
        cout << ans.val() << '\n';
    }
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;