(1). Many __________ of animals eat plants. ____________
(2). Animals and people kill for food, or they kill their__________. ____________
(3). __________ use many kinds of poison on their __________. ____________
(4). Scientists __________ poisonous plants and study them. ____________
(5). Some plants are __________. ____________
(6). Maybe farmers can use __________ poison from plants __________ expensive poison from petroleum. ____________
(7).Mostofthem __________ inthedesertorinthe __________. ____________
(8). They can kill it __________ it is necessary. ____________
(9). Most of these poisons come from petroleum, but petroleum is __________. ____________