#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k, m = 1e9 + 7;
  cin >> n >> k;
  int a[100005];
  a[0] = 1;
  for (int i = 1; i < 100005; ++i) {
    if (i >= k) {
      a[i] = (a[i - k] + a[i - 1]) % m;
    } else {
      a[i] = a[i - 1];
    }
  }
  for (int i = 1; i < 100005; ++i) {
    a[i] = (a[i] + a[i - 1]) % m;
  }
  while (n--) {
    int x, y;
    scanf("%d %d", &x, &y);
    printf("%d\n", (a[y] - a[x - 1] + m) % m);
  }
}
