A．help him explain the information to his roommate.
B．help him write a paper.
C．prepare for a test.
D．tell her if the notes are accurate.

A．many foreign tourists visit the United States every year.
B．Americans enjoy eating out with their friends.
C．the United States is a country of immigrants.
D．Americans prefer foreign foods to their own food.

A．They can make friends with people from other countries.
B．They can get to know people of other cultures and their lifestyles.
C．They can practice speaking foreign languages there.
D．They can meet with businessmen from all over the world.