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It came while i was sleeping. -
I was making dinner when the phone rang. -
I was studying when the program started. -
I listened to music while my sister sang. -
I looked happier when i was with my girlfriend. -
My father was cleaning the bathroom while my mother was cleaning the table. -
It is not a good idea to make noise while we sleep. -
I was dancing when suddenly the power went out. -
I was in class when my mother called. -
We were playing basketball while we read.