A．More and more paper is being consumed nowadays.
B．Paper enables people to receive education more easily.
C．Paper contributes a lot to the keeping of historical records.
D．The invention of paper is of great significance to man.

A．She has been to all the countries in the world.
B．He wants her to recommend some places she has been to.
C．She is really lucky to have traveled a lot.
D．She should he a guide for a travel agency.