Option 1 -> "accept" means to receive or agree to something, which doesn't fit the context of exclusion.
Option 2 -> "excerpt" refers to an extract from a text or document, not relevant here.
Option 3 -> "expect" means to anticipate something, which doesn't convey the meaning of exclusion.
Option 4 -> "except" means excluding or with the exception of, correctly indicating Mr. Roger didn't attend.
Hence, Option 4: except -> The sentence indicates that all staff members attended the meeting with the exception of Mr. Roger who was absent due to illness. "Except" is used to exclude someone or something from a general statement. -> correct