#include<bits/stdc++.h>
#define fo(i,l,r) for(int i=l;i<=r;++i)
#define fu(i,l,r) for(int i=l;i<r;++i)
#define fd(i,r,l) for(int i=r;i>=l;--i)
#define ll long long
#define I inline int
#define V inline void
#define B inline bool
#define L inline ll
#define pi pair<int,int>
#define mk make_pair
#define fi first
#define se second
#define pb push_back
#define vi vector<int>
#define vii vector<pi>
#define popc __builtin_popcount
using namespace std;
const int N=1e6+10,mod=998244353;
char St;
I read() {
	int x=0,y=1;char c=getchar();
	while(c<48||c>57) {if(c==45)y=-y;c=getchar();}
	while(c>=48&&c<=57) x=(x<<1)+(x<<3)+(c^48),c=getchar();
	return x*y;
}
L ksm(ll x,int y) {ll t(1);for(;y;y>>=1,x=x*x%mod)if(y&1)t=t*x%mod;return t;}
I ask(int l,int r) {
	if(l==r) return 0;
	printf("? %d %d\n",l,r);
	fflush(stdout);
	int x;
	scanf("%d",&x);return x;
}
I solve(int l,int r) {
	if(l==r) return l;
	int mid=l+r>>1,se=ask(l,r);
	if(se<=mid) {
		if(l==mid) return solve(mid+1,r);
		int se2=ask(l,mid);
		if(se==se2) {//[l,mid]
			r=mid;
			mid=l+r>>1;
			int se3;
			if(se2<=mid) {
				se3=ask(l,mid);
				if(se3==se2) return solve(l,mid);
				else return solve(mid+1,r);
			}
			else {
				se3=ask(mid+1,r);
				if(se3==se2) return solve(mid+1,r);
				else return solve(l,mid);
			}
		}
		else {
			l=mid+1;mid=l+r>>1;
			int se3=ask(se2,mid);
			if(se3==se2) return solve(l,mid);
			else return solve(mid+1,r);
		}
	}
	else {
		if(mid+1==r) return solve(l,mid);
		int se2=ask(mid+1,r);
		if(se==se2) {
			l=mid+1;
			mid=l+r>>1;
			int se3;
			if(se2<=mid) {
				se3=ask(l,mid);
				if(se3==se2) return solve(l,mid);
				else return solve(mid+1,r);
			}
			else {
				se3=ask(mid+1,r);
				if(se3==se2) return solve(mid+1,r);
				else return solve(l,mid);
			}
		}
		else {
			r=mid;mid=l+r>>1;
			int se3=ask(mid+1,se2);
			if(se3==se2) return solve(mid+1,r);
			else return solve(l,mid);
		}
	}
}
int n;
V solve() {
	scanf("%d",&n);
	printf("! %d\n",solve(1,n));
	fflush(stdout);
}
char Ed;
int main() {
//	cerr<<"memory:"<<(&St-&Ed)/1024.0<<endl;
	int T;scanf("%d",&T);
	while(T--) solve();
//	cerr<<"time:"<<clock()<<endl;
	return 0;
}