Question

correct the text by inserting a comma or commas. (note: in this skill, serial commas are not optional.)

hanoi vietnam has had many names throughout the centuries, including thang long, which means soaring dragon.

Explanation:

A comma is used to separate the city (Hanoi) from the country (Vietnam) as they are in a list - like structure (though here it's just two elements).

Answer:

Hanoi, Vietnam has had many names throughout the centuries, including Thang Long, which means Soaring Dragon.