Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.

          Plants supply man with food clothing, and shelter his most important needs.

          Many of our most useful medicines are also made (16) _______ plants. In addition, plants add beauty and pleasure to our lives. Most people enjoy the smell of flowers, the sight field of waving grain, and the quiet of a forest. Not (17) _______ plants are helpful to man. Some species grow in fields and gardens  as weeds that choke off useful plants. Tiny hits of pollen from (18) _______ plants cause such (19) _______ as asthma and hay fever. Other plants destroy millions of dollars (20) _______ of crops yearly.

Câu 16. A. off                          B. from                 C. by                    D. with

Câu 17. A. all                          B. every                C. any                             D. some

Câu 18. A. any                         B. certain              C. most                 D. all

Câu 19. A. accidents                B. diseases            C. misfortune                 D. disasters

Câu 20. A. worth           B. value                C. price                 D. money