at dead of night
nocturnalat night
on the previous evening
in days of yore
in future
during the period
in them
in the former method
by next week
in the begining
in spring
tune in
at par
at first sight
in my opinion
earlier in this century
early next month
on the side of
on one's side
in the first place
on course
in principle
at
in full career
at its height
at the (time) of
at danger
at the time of
at the moment
at that moment