1. If you heat ice, it __________ (to melt).
  2. If plants don't get enough water, they __________ (to die).
  3. If you mix red and blue, you __________ (to get) purple.
  4. If I go to bed late, I __________ (to feel) tired in the morning.
  5. If fish do not have water, they __________ (to not survive).
  6. If you press this button, the light __________ (to turn) on.
  7. If it rains, the grass __________ (to grow).
  8. If you touch a fire, you __________ (to get) burned.
  9. If you drop an apple, it __________ (to fall) to the ground.
  10. If dogs are hungry, they __________ (to eat) anything.
  11. If you freeze water, it __________ (to become) ice.
  12. If you cut these fruits, they __________ (to turn) brown.
  13. If you do not study, you __________ (to not pass) the exam.
  14. If people don't sleep enough, they __________ (to become) irritable.
  15. If it doesn't rain, the plants __________ (to not grow).
  16. If you call her, she __________ (to answer) the phone.
  17. If you don't water flowers, they __________ (to wilt).
  18. If you stand in the rain, you __________ (to get) wet.
  19. If you don't eat, you __________ (to feel) hungry.
  20. If you heat water to 100 degrees Celsius, it __________ (to boil).