A—phone book B—tools
C—calculator D—message saving
E—phone setting F—backlight setting
G—key lock H—automatic redial
I—sound volume J—ring type
K—voicemail L—additional functions
M—own number N—alarm
O—new message P—network
Q—delete all

A．have longer sleep periods after work
B．make the light darker than usual
C．try to reset their “internal clock”
D．pay more attention to their work

A．To avoid waiting in lines at the booking office．
B．To hand in necessary travelling documents．
C．To get tickets from the nearest terminal．
D．To fix the travelling destination in time．