# ThinhNguyen97
"""
I Miss Those Moments I Spent With You
Kitchen
Table
Mirror
Sofa
"""
# Python is scripting language use interpreter
# import numpy as np
# import matplotlib.pyplot as plt
# import pandas as pd


from math import *
from builtins import staticmethod
from collections import Counter
from collections import defaultdict
from collections import namedtuple
from collections import deque
from queue import LifoQueue
import heapq
import functools
import hashlib
from datetime import datetime, timedelta
import json
import re
from itertools import *
import queue
from bisect import bisect_left


def solve(m, cost):
    # Create a dictionary to store the indices of flavors based on their prices
    flavor_indices = {}

    # Iterate through the list of costs
    for i in range(len(cost)):
        # Calculate the remaining amount of money after purchasing the current flavor
        remaining_money = m - cost[i]

        # Check if the remaining money corresponds to the price of any previously visited flavor
        if remaining_money in flavor_indices:
            # If found, return the indices of the two flavors (1-based indexing)
            return [flavor_indices[remaining_money] + 1, i + 1]
        else:
            # If not found, store the current flavor's index in the dictionary
            flavor_indices[cost[i]] = i


def main():
    t = int(input().strip())
    for _ in range(t):
        m = int(input().strip())
        n = int(input().strip())
        arr = list(map(int, input().rstrip().split()))
        result = solve(m, arr)
        print(result[0], result[1])


if __name__ == '__main__':
    main()