16. Louis Herman， at the University of Hawaii， has ________ a series of new experiments in which some animals have learned to understand sentences.
A) installed B) equipped C) devised D) formatted
17. Researchers at the University of Illinois determined that the ________ of a father can help improve a child‘s grades.
A) involvement B) interaction C) association D) communication
18. We can accept your order ________ payment is made in advance.
A) in the belief that B) in order that C) on the excuse that D) on condition that
19. Many in the credit industry expect that credit cards will eventually ________ paper money for almost every purchase.
A) exchange B) reduce C) replace D) trade
20. Any donation you can give will help us ________ the suffering and isolation of the homeless this New Year.
A) lift B) patch C) comfort D) ease
16-20 CADCD