[填空题]The Tomato Growers Association, or TGA, has set out to grow a (15)_______________tomato at an(16)_______________farm near San Diego, California. Employing biotechnology and developments in DNA research, the TGA has determined to grow the "tomato of tomorrow." By (17)_______________a repellent in the form of an odor, the tomato plant would be able to fight off (18)_______________by insects. It would (19)_______________disease and rot, and would maintain its shape when (20)_______________at the bottom of a (21)_______________of tons of tomatoes. (22)___________________________________________________________________________Its heavy, thick leaves would prevent it from becoming sunburned. All tomatoes on a plant would ripen at the same time, to prevent the loss from machine harvest of under-or-over ripened fruit. (23)__________________________________________________________________________________________While development of this plant will prove to be extremely expensive, TGA scient