The first blank does not require an article because "Mary" is a proper noun that refers to a specific person who is already known. Proper nouns do not require an article.
The second blank requires the indefinite article "a" because "beautiful silver chain" is a singular countable noun, and we are referring to one chain in general.
The sentence becomes:
Mary was wearing a beautiful silver chain around her neck.
The correct answer is "No Article ... a".
Each question has a sentence that has an underlined part. Choose the option which rephrases the underlined part in the most appropriate manner in terms of grammar and usage.
In an attempt to boost their profits, many edible oil-producing companies have been engaging themselves in propaganda against commonly used oils and promoting exotic and expensive varieties of oils \(\underline{as\ more\ healthier\ options.} \)