Help Agent 007 complete his top-secret mission report by choosing the correct word for each blank.

I was waiting at the bus stop when a mysterious man approached. He placed an unmarked envelope on the bench and vanished into the night.

I was waiting at the bus stop when a mysterious man approached. He placed an unmarked envelope on the bench and vanished into the night.

at: We use "at" for specific point locations like a bus stop or a station.

an: Use "an" before singular, countable nouns that begin with a vowel sound (unmarked).

on: We use "on" for flat surfaces, like a bench, table, or wall.

the: "Into the night" is a specific idiomatic phrase requiring the definite article.