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

Many of our most useful medicines are also made (1).......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 (2)..........plants are helpful to man.Some species grow in fields and gardens as weed that choke off useful plants.Tiny hít of pollen from (3).......plants cause such (4)........as asthma and hay fever.other plants destroy millions of dollars (5)........of crops yearly.

1. A.of B.from C.by D.with

2. A.all B.every C.any D.some

3. A. any B.certain C. most D.all

4. A.accidents B.diseases C.misfortune D.disasters

5. A.worth B.value C.price D.money