Learning how to use the Internet (effective) ______ is very important for the students today.

A．11 p.m. of that day.
B．11 a.m. of the previous day.
C．11 p.m. of next day.
D．11 p.m. of the previous day.

A．To go to the school dining hall with the girl.
B．To eat the sandwich his mother has made for him.
C．To have lunch with the girl at the restaurant.
D．To drink a glass of water only.