Question

The restaurant across the street _______________
Fill in the blank with the appropriate predicate.
serves the best hamburgers.
serving the best hamburgers in town.
with the statute of the owner in the lobby.
serve the best hamburgers

Answer 1

I believe it is "The restaurant across the street serve the best hamburgers."

Answer 2

The correct answer would be "The restaurant across the street SERVES the best hamburgers."

Restaurant is not plural, therefore the verb, serves, is the correct form and therefore, the first option is correct.