1.He is the only one of the people here who(know)how to operate this computer

1.He is the only one of the people here who(know)how to operate this computer
2.He is one of the people here who (know) how to operate this computer
3.My hometown is no longer(whom;that;who;what)she used to be
4..My hometown is no longer(同上 选一个)she used to be
5.She decided to buy the house,(whose;which;of which;that)windows faced the blue sea
6.She decided to buy the house,the windows(同上)faced the biue sea
7.I'll never forget the days(whe;that;in which;that)i spent on the farm
8.I'll never forget the days(同上)i worked on the farm
9.Is that exhibition(where;that;in which;the one)
10.Is that the exhibition(同上)they visited last Sunday?