t = int(input())
for _ in range(t):
    n, m = map(int, input().split())
    a = [0 for i in range(n)]
    otr = []
    for i in range(m):
        x, y = map(int, input().split())
        x -= 1
        y -= 1
        otr.append((x, y))
    k = int(input())
    f1 = 0
    for i in range(k):
        zap = int(input())
        if f1:
            continue
        zap -= 1
        a[zap] = 1
        f = 0
        for e in otr:
            if sum(a[e[0]:e[1] + 1]) > (e[1] - e[0] + 1) / 2:
                f += 1
        if f > 0:
            print(i + 1)
            f1 = 1
    if f1 == 0:
        print(-1)