#include <cstdio>

int ask(int l, int r) {
	printf("? %d %d\n", l, r);
	fflush(stdout);
	int x; scanf("%d", &x);
	return x;
}

int solve(int l, int r, int x = -1) {
	if(x == -1 && l != r) x = ask(l, r);
	if(l == r) return l;
	if(l == r - 1) return l + r - x;
	if(l == r - 2) {
		int x = ask(l, r);
		if(x == l) return solve(l + 1, r);
		if(x == r) return solve(l, r - 1);
		return (ask(l, x) == x) ? l : r;
	}
	int mid = (l + r) / 2;
	if(x <= mid) {
		int x_l = ask(l, mid);
		if(x_l == x) return solve(l, mid, x);
		int mid2 = (r + mid + 1) / 2;
		if(ask(x, mid2) == x) return solve(mid + 1, mid2);
		else return solve(mid2 + 1, r);
	} else {
		int x_r = ask(mid + 1, r);
		if(x_r == x) return solve(mid + 1, r, x);
		int mid2 = (l + mid) / 2;
		if(ask(mid2 + 1, x) == x) return solve(mid2 + 1, mid);
		else return solve(l, mid2);
	}
}

int main() {
	int T; scanf("%d", &T);
	for(;T--;) {
		int n; scanf("%d", &n);
		printf("! %d\n", solve(1, n));
		fflush(stdout);
	}
}