input question: What is the missing first step of the following process: - Add water into the tray - You insert the tray into a freezer - The water molecules begin to slow down - The water becomes ice - The ice cubes are ready.???
output answer: You take a tray

input question: What is the missing first step of the following process: - Chemical compounds rise into the air - Chemical compounds mix with elements in clouds - The affected rain falls to the earth - The affected rain can harm natural and man-made objects because of its acidic content.???
output answer: Human industry produces chemical compounds

input question: What is the missing first step of the following process: - These plants die - The soil gains organic material - The soil becomes more fertile - Larger plants are able to be supported - Trees eventually grow.???
output answer: Grass and small plants grow in an area

input question: What is the missing first step of the following process: - Water is put in pipes in the coal-fired steam station - The coal is crushed - The coal is moved into a boiler along with hot air - The water is moving through pipes in the boiler - The steam from the water is blown against a turning mechanism - The force of the steam makes the mechanism turn - The mechanism generates electricity.???
output answer:
Coal is put in a coal-fired steam station