Directions: Using the given words to complete the following paragraph.（每题2分, 共10分） Some (not all) e-mail systems have ____1____ that try to combat this problem. These features (usually called “notification”) will ____2____ you when a person has received your e-mail and may also tell you when the person has read it (really all it can do is ___3___ you that the person has looked at the first screen of the message — it has no way to know if the person has read the message ____4____). Referring back to the example in the ___5____ paragraph, you could check to see who has checked their e-mail before the meeting and then telephone those who have not read it. A. 1 B. 2 C. 3 D. 4 E. 5