Question

decide whether each sentence is punctuated correctly. use the drop-down menus to choose which revisions, if any, are necessary.
when you go to the supermarket, please buy eggs, milk, pears, and carrots.
remove comma after pears
add a comma after buy
no revision needed
, charles and boris.
mariana hopes to study chemistry geometry, and italian.

Explanation:

1. For the first sentence: The Oxford comma (the comma before "and" in a list) is a standard, acceptable punctuation in English, and the introductory clause is correctly followed by a comma. No changes are needed.
2. For the second sentence: "chemistry" and "geometry" are items in a list, so they need a comma between them to separate the list elements properly.

Answer:

1. no revision needed
2. add a comma after chemistry