What happens next in this paragraph?

How to demonstrate the greenhouse effect
Place the thermometers in direct sunlight.
Put them on a concrete or wood surface that is in direct sunlight outside. Allow them to sit in the sun for 3 minutes.
Choices:
I. After this time, look for small, bug-like insects that hang out from the thermometers to help refresh the plants. If you place the thermometers close to the heated center of the greenhouse, they will remain in direct sunlight.
II. Set the timer or clock to 3 minutes so you know when the time is up. You can also place the thermometers under a sun lamp for 3 minutes if you are creating a model indoors.
III. After the sun sets, the thermometer will go into the lab for an additional 15 minutes. Put some rocks, pebbles, vases or greenery around the thermometers.
IV. Use a squat lamp to check the thermometer. An thermometer should read 25 degrees f (13 degrees c).
II.