1.I wrote a letter of thanksto the man( )helped us the other

1.I wrote a letter of thanksto the man( )helped us the other day.
2.Sorry,the man( )you want to see is away on business.
3.Do you know the girl( )wesrd dark dress?
4.Have you read the book( )tells about the graet wall?
5.Where are the magazines( )I borrowed from the libarary this morning?
6.The trees( )we planted last spring are growing well.