to come in;  to go in;  to enter;  to penetrate
To penetrate into a forest
Alcohol goes/gets into the bloodstream very quickly
To ask/invite somebody in
to join;  to enter
It is not easy to join this club
in;  into
To put one's hands in one's pockets
To fire/shoot into the crowd
at
At about 10 am
on
They arrived in Vietnam on a fine day in August
(On) what dates are you free?
in
In (the year) 25 BC
(bóng đá)  (       vào !)  goal !