//传送门：http://acm.hdu.edu.cn/showproblem.php?pid=6027
#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <cmath>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
using namespace std;
#define FOR(i,k,n) for(int i=k;i<n;i++)
#define FORR(i,k,n) for(int i=k;i<=n;i++)
#define scan(a) scanf("%d",&a)
#define scann(a,b) scanf("%d%d",&a,&b)
#define scannn(a,b,c) scanf("%d%d%d",&a,&b,&c)
#define mst(a,n) memset(a,n,sizeof(a))
#define ll long long
#define N 1005
#define mod 1000000007
#define INF 0x3f3f3f3f
const double eps=1e-8;
const double pi=acos(-1.0);
int main()
{
//freopen("in.txt","r",stdin);
//freopen("out.txt","w",stdout);
int t;
cin>>t;
while(t--)
{
ll n,k;
cin>>n>>k;
ll ans=0;
for(ll i=1;i<=n;i++)
{
ll tmp=1;
for(ll j=0;j<k;j++)
{
tmp=tmp*i%mod;
}
ans=(ans+tmp)%mod;
}
cout<<ans<<endl;
}
return 0;
}
