用“when"或"while"填空

用“when"或"while"填空
1.___Margo was talking on the phone her sister walked in.
2.___we visited the school,the children were playing games.
3.___Satah was at the barber's,I was going to class.
4.___I saw Sarlos,he was wearing a green shirt.
5.___Ali was cleaning his room,the phone rang.
6.___Rita bougut her a new dog ,it was wearing a little coat.