13. Our bones become ______ as we age, so it will be increasingly difficult to bend or even move around as we get older.
(A) rigid (B) upright (C) stiff (D) depressed
15. The company made a fortune by turning our environmental concerns into a _____ business, and that is why it is
criticized by so many people.
(A) diligent (B) profitable (C) lucrative (D) regrettable
29. If you really need it so urgently, I can ______ to you today.
(A) have it being delivered (B) have it delivered (C) deliver it (D) have delivered it