#include <iostream>
#include <algorithm>
using namespace std;
const int N = 2010, mod = 1e9 + 7;
int c[N][N];
void init()
{
for (int i = 0; i < N; i ++ )
for (int j = 0; j <= i; j ++ )
if (!j) c[i][j] = 1;
else c[i][j] = (c[i - 1][j] + c[i - 1][j - 1]) % mod;
}
int main()
{
int n;
cin >> n;
init();
while (n -- )
{
int a, b;
cin >> a >> b;
cout << c[a][b] << endl;
}
return 0;
}