Question

correct the text by inserting two commas. (note: in this skill, serial commas are not optional.) on december 21, 1968, apollo 8, the first spacecraft carrying humans to orbit the moon, was launched from cape canaveral florida with three astronauts aboard.

Explanation:

1. Add a comma after "1968" to set off the introductory date phrase.
2. Add a comma after "Florida" to set off the geographic location (city, state) properly.
3. Add a comma after "Apollo 8" and after "moon" to set off the non-restrictive clause that provides extra information about the spacecraft.

Answer:

On December 21, 1968, Apollo 8, the first spacecraft carrying humans to orbit the moon, was launched from Cape Canaveral, Florida, with three astronauts aboard.