#include<bits/stdc++.h>
using namespace std;
long long p=1000000007;
long long fmod(long long x){
 
    if(x==1)return 1;
    return ((x%p)*fmod(x-1))%p;
}
///using fermats little theorem
long long mmi(long long x){
    long long y = p-2;
    long long result = 1;
    while(y){
        if(y&1)result = (result*x)%p;
        x = (x*x)%p;
        y>>=1;
    }
    return result;
}
 
int main(){
    int t;
    cin>>t;
    while(t--){
        long long n,m;
        cin>>n>>m;
        printf("%lld\n", ((fmod(m+n-2)*mmi(((fmod(m-1)%p)*(fmod(n-1)%p))%p))%p));
    }
 
}
 

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