Final answer:
The sentence 'I walked ______ the street' can have 'across' or 'down' based on the context. 'Across' indicates you moved from one side to another, while 'down' means you moved along the street.
Step-by-step explanation:
The correct preposition to fill in the blank in the sentence 'I walked ______ the street' would be 'across' or 'down', depending on the context. 'Across' implies that you moved from one side of the street to another side, whereas 'down' indicates that you moved along the street in one direction. These nuances make understanding the usage of prepositions vital in English language studies to convey accurate meanings.
Learn more about Prepositions