填空题

The business memo (备忘录) is probably the most frequently used communication within a company. It is called an intra-company communication because it is used by people in their own company or organization. They change to letters, however, when they write messages to people who do not work for their company.
A memo creates a written record that may or may not be filed, depending on the receiver and the subject. As you know, spoken messages may be misunderstood or forgotten. A memo, however, becomes a record that does much to ensure the complete communication between the sender and the receiver.
The standard form of a memo frequently carries a pre-printed series of items: To, From, Date, and Subject. The first two items include the names of the receiver and the sender. A well-written subject line tells the reader the key topic or topics the memo is about.
Business Memo
Function: for communication within a (46)
Purpose:
(1) to keep a (47)
(2) to (48) the complete communication
Items involved:
(1) Receiver
(2) (49)
(3) Date
(4) (50)