Question

insert one comma to separate the coordinate adjectives.
mr. wilkinson, who owns the gym on clover street, has posted clever eye-catching flyers all around town to advertise his reduced summertime prices.

Explanation:

Coordinate adjectives are adjectives that modify the same noun and can be separated by a comma (and their order can be reversed). In the sentence, "clever" and "eye - catching" both modify "flyers" and are coordinate adjectives. So we insert a comma between them.

Answer:

Mr. Wilkinson, who owns the gym on Clover Street, has posted clever, eye - catching flyers all around town to advertise his reduced summertime prices.