Write each sentence, using the subject
pronoun that best replaces the underlined word or words.
The neighborhood grocer sells a lot of fresh fruit.
underlined word The neighborhood grocer
http://www.grammarbook.com/grammar/pronoun.asp
they sell a lot of fresh fruit
He sells a lot of fresh fruit.
The subject pronoun that best replaces the underlined word "The neighborhood grocer" is "They". Therefore, the sentence would be written as:
"They sell a lot of fresh fruit."