........the morning (by/on/in/for/at)
in
do something...........mistake (by/on/in/for/at)
by
go..........foot (by/on/in/for/at)
on
go........a walk (by/on/in/for/at)
for
go..........an excursion (by/on/in/for/at)
on
be.........the phone (by/on/in/for/at)
on
.......night (by/on/in/for/at)
at