#include <bits/stdc++.h>
using namespace std;
#define int long long
#define mid ((l+r)>>1)
#define mod (998244353)
// #define mod (1000000007)
#define ull unsigned long long
#define eps (1e-8)
#define mk make_pair
#define tim (double)clock()/CLOCKS_PER_SEC
#define For(i,a,b) for(int i=(a);i<=(b);++i)
#define rep(i,a,b) for(int i=(a);i>=(b);--i)
inline namespace IO{
	inline int read(){
		int x=0,f=1;char ch;
		while((ch=getchar())<'0'||x>'9')if(ch=='-')f=-1;
		while(ch>='0'&&ch<='9'){x=((x<<1)+(x<<3)+(ch^48)),ch=getchar();}
		return x*f;
	}
	void write(char x){putchar(x);}
	void write(const char *x){for(;*x;++x)putchar(*x);}
	void write(char *x){for(;*x;++x)putchar(*x);}
	void write(signed x){
		if(x<0)putchar('-'),x=-x;
		if(x>9)write(x/10); putchar('0'+x-x/10*10);
	}
	void write(long long x){
		if(x<0)putchar('-'),x=-x;
		if(x>9)write(x/10); putchar('0'+x-x/10*10);
	}
	void write(unsigned long long x){
		if(x>9)write(x/10);
		putchar('0'+x-x/10*10);
	}
	void write(double x){printf("%0.5lf",x);}
	template<typename type1,typename type2,typename ...typen>
	void write(type1 a1,type2 a2,typen ...an){
		write(a1);
		write(a2,an...);
	}
}using namespace IO;
inline int gcd(int x,int y){return y==0?x:gcd(y,x%y);}
inline int lcm(int x,int y){return x/gcd(x,y)*y;}
inline int lowbit(int x){return x&(-x);}
const int N=1900005;
inline int qpow(int a,int b){
	int res=1;
	for(;b;b>>=1){
		if(b&1)res=res*a%mod;
		a=a*a%mod;
	}return res;
}
int n;

inline void work(){
	cin>>n;
	for(int i=1;i+1<=n;i+=2){
		cout<<"? "<<i<<' '<<i+1<<endl;
		int x; cin>>x;
		if(x==1){
			int pos=0;
			for(int j=1;j<=n;j++){
				if(j%2==0&&i==j-1)continue;
				if(j%2==1&&i==j+1)continue;
				if(i==j)continue;
				pos=j;
				cout<<"? "<<i<<' '<<j<<endl;
				cin>>x;
				break;
			}
			if(x==0){
				int cnt=0;
				for(int j=1;j<=n;j++){
					if(j%2==0&&i+1==j-1)continue;
					if(j%2==1&&i+1==j+1)continue;
					if(i+1==j)continue;
					cnt++;
					cout<<"? "<<i+1<<' '<<j<<endl;
					cin>>x;
					if(x==0){
						cout<<"! 1"<<endl;
						return;
					}
					if(cnt>=2)break;
				}
				cout<<"! 2"<<endl;
				return;
			}else{
				for(int j=pos+1;j<=n;j++){
					if(j%2==0&&i==j-1)continue;
					if(j%2==1&&i==j+1)continue;
					if(i==j)continue;
					cout<<"? "<<i<<' '<<j<<endl;
					cin>>x;
					if(x==0){
						cout<<"! 1"<<endl;
						return;
					}else{
						cout<<"! 2"<<endl;
						return;
					}
				}
			}
			return;
		}
	}
	if(n&1){
		int x; 
		cout<<"? "<<1<<' '<<n<<endl;
		cin>>x;
		if(!x){
			cout<<"! 1"<<endl;
			return;
		}
		cout<<"? "<<2<<' '<<n<<endl;
		cin>>x;
		if(!x){
			cout<<"! 1"<<endl;
			return;
		}
		cout<<"! 2"<<endl;
	}else{
		cout<<"! 1"<<endl;
	}
}
signed main()
{
	// freopen("data.in","r",stdin);
	// freopen("std1.out","w",stdout);
	int T=read();
	For(i,1,T)work();
	return 0;
}
/*
1 0


*/