Sridhar Nag S said:
is there any way that i can repair only two keys on the key board.......
I don't know how to repair just a few keys. Perhaps someone else does.
If I had to try I'd remove the keyboard and study the key latching system and see if there was a way to make it return to proper position. I suspect you'll find that some component had to be bent to remove the keys, and that even if you bent it back and got the keys back on they would be weakly attached and fall off again.
For me, this seems like knowing the only part of the lightbulb that failed is the filament and wondering how to install a new filament in a failed lightbulb. The concept of recycling the keyboard is good, but they are designed to be non-repairable.