( )when did she wait on the freezing cold morning.(要原因) / Until For WhenMy father often writes me ( ) my study.in connetion in connection with connect on connection toThey regarded her ( ) their big sister.for as to at

( )when did she wait on the freezing cold morning.(要原因) / Until For When
My father often writes me ( ) my study.
in connetion in connection with connect on connection to
They regarded her ( ) their big sister.
for as to at