/*

        /////////  /////      ////     ///
        //        //   //    //  // // //
        //////   //    //   //   //   //
            //  // /// //  //        //
      //////// //      // //        //
      
         

*/

#include<bits/stdc++.h>
#include<assert.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;
#define Fast ios_base::sync_with_stdio(false); cin.tie(NULL);cout.tie(0);
#define rep(i,s,n) for(int i=s;i<n;i++)
#define mod 1000000007
#define umap unordered_map
#define pb(x) push_back(x)
#define all(x) (x).begin(), (x).end()
#define lb() lower_bound()
#define ub() upper_bound()
#define S second
#define F first
#define PI  3.14159265358979323846 

//fill(all(vec), 1);to fill vector with a number
//if (S.count(key)) returns 1 if set or map contain key else return 0
ll nCr(ll n,ll r)
{
	r = min(r,n-r);
	if(r<0)
		 return 0;
	if(r == 0)
		return 1;
	ll ans = 1;
	for(ll i = 1;i<=r;i++)
	{
		ans = ans*(n-i+1)/i;
    }
	return ans;
 		
}


ll logn(int n, int r) 
{ 
     return (n > r - 1) ? 1 + logn(n / r, r) : 0; 
} 


ll power(ll a,ll b) {
	if(b == 1) return a;
	if(b == 0) return 1;
	ll m1 = power(a,b/2);
	if(b%2) return m1*m1*a;
	return m1*m1;
}


bool isprime(ll a)
{
    if(a<=1)
        return false;
    if(a==2||a==3)
        return true;
    if(a%2==0||a%3==0)
        return false;
    for(ll i=5;i*i<=a;i=i+6)
    {
        if(a%i==0||a%(i+2)==0)
            return false;
    }
    return true;

}
/*********************//*********************//*********************//*********************///

void solve()
{
   int n;
   cin>>n;
   vector<ll>a(n);
   ll so=0,se=0;
   rep(i,0,n)
   {
       cin>>a[i];
        if(i%2)
            so+=a[i];
        else
        {
            se+=a[i];
        }
        
   }
   if(se>so)
   {
       rep(i,0,n)
       {
           if(i%2)
                cout<<1<<" ";
            else
            {
                cout<<a[i]<<" ";
            }
            
       }
   }
   else
   {
       rep(i,0,n)
       {
           if(i%2==0)
                cout<<1<<" ";
            else
            {
                cout<<a[i]<<" ";
            }
            
       }
   }
   cout<<endl;
   
}



int main()
{
    Fast
    ll t=1;
/*
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
*/
    cin>>t;
    for(ll i=1;i<=t;i++)
    {
      solve();
    }

    
    return 0;
}