1.The steel [ of ] the watch is made of best quality.
2.Who is the man [ whom ] you were talking when I saw you at the gate yesterday?（这里没打错吗?应该是you were talking to)
3.Thousands of people have come to visit the house [ where ] Premier Zhou spent his childhood.（错误：应该是have came）
4.Near the window there was a shelf [ which ] Karl Marx laid books and magazines.
5.I am going to pay a visit to my hometown [ where ] I have been away for more than ten years.