They sent us (as they had agreed to do) all the papers in the case.
We expect John to bring his roommate home with him (he has been very anxious to do so); but we expect no one else.
Modern usage is to avoid entirely the use of the parentheses.
The Bracket
131. Use the bracket to enclose some statement or word of the writer that is thrown into a quotation by way of explanation or otherwise.
His letter reads: "We have decided to get Mr. Howard [his cousin] to deliver the address..."
132. Use quotation marks to enclose quotations of the exact language of another.
The Bible says, "Charity suffereth long."
133. Use single quotation marks (' ') to enclose a quotation within a quotation.