Passive voice because usually if an object is undergoing in action you can tell because passive voice is normally used.
Answer:
3) Refusing an invitation
4) We would be delighted if you could come
Explanation:
Parenthetical citations and the works cited page both is a reference on the paper or information that you are reading or looking up; but are used in a different way. Parenthetical citations is a quick note-taking with citation( last name of the author, page number), when you are reading the information. While a work cited page provide more information or source, such as publisher, publishing date, and etc.
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