100b.cpp

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*/
#include <bits/stdc++.h>
using namespace std;

#define fastio                  \
  ios_base::sync_with_stdio(0); \
  cin.tie(0)
#define LL long long
#define mod 1000000007
#define all(v) v.begin(), v.end()
#define pr(v) pair<v, v>
#define pb push_back
#define FOR(i, j, k) for (auto i = j; i < k; i++)
#define ROF(i, j, k) for (auto i = j; i >= k; i--)
#define debug(...) fprintf(stderr, __VA_ARGS__), fflush(stderr)
#define time__(d) for (long blockTime = 0; (blockTime == 0 ? (blockTime = clock()) != 0 : false); debug("%s time : %.4fs", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))

const long long INF = 1e18;
const long long MAX = 2e5 + 10;
int main()
{
  fastio;
  int t = 1;
  cin >> t;
  while (t--)
  {
    int n;
    cin >> n;
    LL s = 0, ss = 0;
    int a[n];
    FOR(i, 0, n)
        cin >> a[i],
        ss += a[i];
    FOR(i, 0, n)
    {
      if (i & 1)
        s += a[i] - 1;
    }
    s *= 2;
    if (s <= ss)
    {
      FOR(i, 0, n)
          if (i & 1) cout << 1 << " ";
      else cout << a[i] << " ";
      cout << "\n";
      continue;
    }
    FOR(i, 0, n)
        if (i & 1) cout << a[i] << " ";
    else cout << 1 << " ";
    cout << "\n";
  }
}