Question

correct the text by inserting two commas. (note: in this skill, serial commas are not optional.)
sir malcolm campbell set a land-speed record on september 3 1935 when he drove more than three hundred miles per hour.

Explanation:

To correct the text, we need to insert commas in the date (between the day and the year) and also consider the structure. The correct placement is after "September 3" and after "1935" to properly format the date. So the corrected sentence is: "Sir Malcolm Campbell set a land - speed record on September 3, 1935, when he drove more than three hundred miles per hour."

Answer:

Sir Malcolm Campbell set a land - speed record on September 3, 1935, when he drove more than three hundred miles per hour.