#include "bits/stdc++.h"
using namespace std;

const double pi = acos(-1);

int main()
{
    freopen("cylinders.in" ,"r" ,stdin);

    int t;
    scanf("%d",&t);
    while(t--){
        int n;
        scanf("%d",&n);
        vector <pair<double ,int>> vs;
        for(int a,b,i=0; i<n; i++){
            scanf("%d%d",&a,&b);
            vs.push_back({a*pi*b*b ,0});
        }
        int m;
        scanf("%d",&m);
        vector <pair<long long ,int>> s(m);
        for(int i=0; i<m; i++)
            scanf("%I64d",&s[i].first) ,s[i].second = i;
        sort(vs.begin() ,vs.end());
        sort(s.begin() ,s.end());

        for(int i=n-1; i; i--){
            vs[i].first -= vs[i-1].first;
            vs[i].second = n-i;
        }vs[0].second = n;
        //for(int i=0; i<n; i++)
          //  cout << vs[i].first << ' ' << vs[i].second << endl;
        //cout << "-------------" << endl;

        int vs_ptr = 0;
        vector <double> ans(m ,-1e9);
        double bef = 0 ,time = 0;
        for(auto&q : s){
            long long w = q.first;
            while(vs_ptr < n && bef + vs[vs_ptr].first*vs[vs_ptr].second <= w){
                bef += vs[vs_ptr].first*vs[vs_ptr].second;
                time += vs[vs_ptr].first;
                vs_ptr++;
            }
            //cout << " --- " << vs_ptr << ' ' << bef << ' ' << time << endl;
            if(bef < w && vs_ptr == n)
                break;
            ans[q.second] = (time + (w - bef)/vs[vs_ptr].second);
        }

        for(auto&a : ans){
            if(a < 0)
                printf("IMPOSSIBLE\n");
            else
                printf("%.2lf\n",a);
        }
    }
}