linux - How can I use awk for modify a column based in the first column? -

i have data this, , need automatize simple task. need make second value of row, become same first cell in next row in sequence this:

first second 1   2 4   6 10  12 25  28 30  35 

become

first second 1   4 4   10 10  25 25  30 30  35 

$ awk 'nr==1; nr>2{print p[1], $1} {split($0,p)} end{print p[1], p[2]}' file first second 1 4 4 10 10 25 25 30 30 35