The best method to _____ the goal of helping the patients with AIDS is to unite as many sympathetic people as possible.

As its name ________, the Volunteer Farm relies on volunteers to weed, plant and harvest.

Leaders of many countries have been trying to ______ what it is that makes China develop so fast. 

But someday, all the work we have done will ____; we will go to college and go on to’have a suitable job．

Columbus is known for the great discovery ____ a new land-America.