drop

Question 1

drop out(of)

Answer 1

bỏ học

Question 2

drop by
drop by/in | drop in on somebody | drop into something
(British English also drop round)
to pay an informal visit to a person or a place

Answer 2

Drop by sometime.
I thought I’d drop in on you while I was passing.
Sorry we’re late—we dropped into the pub on the way