public static void main ( String [ ] args ) {
  int t = scanner . nextInt ( ) ;
  while ( t -- > 0 ) {
    StringBuilder sb = new StringBuilder ( ) ;
    int n = scanner . nextInt ( ) ;
    int a [ ] = new int [ n ] ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) a [ i ] = scanner . nextInt ( ) ;
    int b [ ] = new int [ n ] , c [ ] = new int [ n ] ;
    long compare = 0 ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      if ( i % 2 == 0 ) {
        compare += a [ i ] - 1 ;
        b [ i ] = 1 ;
      }
      else {
        b [ i ] = a [ i ] ;
      }
    }
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      if ( i % 2 == 1 ) {
        compare -= a [ i ] - 1 ;
        c [ i ] = 1 ;
      }
      else {
        c [ i ] = a [ i ] ;
      }
    }
    if ( compare < 0 ) {
      for ( int i = 0 ;
      i < n ;
      i ++ ) sb . append ( b [ i ] + " " ) ;
    }
    else {
      for ( int i = 0 ;
      i < n ;
      i ++ ) sb . append ( c [ i ] + " " ) ;
    }
    System . out . println ( sb ) ;
  }
}

public static void main ( String [ ] args ) { int t = scanner . nextInt ( ) ; while ( t -- > 0 ) { StringBuilder sb = new StringBuilder ( ) ; int n = scanner . nextInt ( ) ; int a [ ] = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) a [ i ] = scanner . nextInt ( ) ; int b [ ] = new int [ n ] , c [ ] = new int [ n ] ; long compare = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( i % 2 == 0 ) { compare += a [ i ] - 1 ; b [ i ] = 1 ; } else { b [ i ] = a [ i ] ; } } for ( int i = 0 ; i < n ; i ++ ) { if ( i % 2 == 1 ) { compare -= a [ i ] - 1 ; c [ i ] = 1 ; } else { c [ i ] = a [ i ] ; } } if ( compare < 0 ) { for ( int i = 0 ; i < n ; i ++ ) sb . append ( b [ i ] + " ▁ " ) ; } else { for ( int i = 0 ; i < n ; i ++ ) sb . append ( c [ i ] + " ▁ " ) ; } System . out . println ( sb ) ; } }
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