//teja349
#include <bits/stdc++.h>
#include <vector>
#include <set>
#include <map>
#include <string>
#include <cstdio>
#include <cstdlib>
#include <climits>
#include <utility>
#include <algorithm>
#include <cmath>
#include <queue>
#include <stack>
#include <iomanip> 
//setbase - cout << setbase (16); cout << 100 << endl; Prints 64
//setfill -   cout << setfill ('x') << setw (5); cout << 77 << endl; prints xxx77
//setprecision - cout << setprecision (14) << f << endl; Prints x.xxxx
//cout.precision(x)  cout<<fixed<<val;  // prints x digits after decimal in val

using namespace std;
#define f(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) f(i,0,n)
#define fd(i,a,b) for(i=a;i>=b;i--)
#define pb push_back
#define mp make_pair
#define vi vector< int >
#define vl vector< ll >
#define ss second
#define ff first
#define ll long long
#define pii pair< int,int >
#define pll pair< ll,ll >
#define sz(a) a.size()
#define inf (1000*1000*1000+5)
#define all(a) a.begin(),a.end()
#define tri pair<int,pii>
#define vii vector<pii>
#define vll vector<pll>
#define viii vector<tri>
#define mod (1000*1000*1000+7)
#define pqueue priority_queue< int >
#define pdqueue priority_queue< int,vi ,greater< int > >
#define flush fflush(stdout) 
#define primeDEN 727999983
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
template <typename T>
void printvec(vector<T>& vec){
	for(int i=0;i<vec.size();i++){
		cout<<vec[i]<<" ";
	}
	cout<<endl;
}


int l[123456],r[123456];
int main(){
    std::ios::sync_with_stdio(false); cin.tie(NULL);
    int t;
    cin>>t;
    while(t--){
    	int n,m;
    	cin>>n>>m;
    	set<pii> seti;
    	int i;
    	rep(i,n){
    		cin>>l[i]>>r[i];
    		seti.insert(mp(l[i],r[i]));
    	}
    	int val;
    	set<pii>::iterator it;
    	rep(i,m){
    		cin>>val;
    		it=seti.lower_bound(mp(val,0));
    		if(it==seti.end()){
    			it--;
    			if(it->ss>val){
    				cout<<0<<endl;
    			}
    			else{
    				cout<<-1<<endl;
    			}
    		}
    		else{
    			if(it!=seti.begin()){
    				it--;
    				if(it->ss>val){
    					cout<<0<<endl;
    					continue;
    				}
    				else{
    					it++;
    					cout<<it->ff-val<<endl;
    				}

    			}
    			else{
    				cout<<it->ff-val<<endl;
    			}

    		}
    	}

    }
    return 0;   
}