HEAT, LIGHT, SOUND AND ELECTRICITY. HEAT.
Gap-fill exercise
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
USE THESE WORDS.
three
expand
temperature
size
heat
contraction
energy
state
expansion
contract