16. That poor man is so weak that he can scarcely walk.

　　[A] crude                [B] bereft            [C] adept               [D] decrepit

　　17. In his letter of January 27, Mr. Anderson declined the offer.

　　[A] repeated             [B] refused           [C] described            [D] analyzed

　　18. Many caves are formed by the pounding of ocean waves on the coastline.

　　[A] cavalries             [B] caverns          [C] shells                [D] beaches

　　19. Agricultural experts always caution farmers to irrigate in regions receiving only light rainfall.

　　[A] remind              [B] teach            [C] find                  [D] warn

　　20.  In many parts of the world, talismans are used to ward off evil.

　　[A] keep away            [B] describe          [C] transcend            [D] seek out

　　Keys: DBBDA