Night________(fall),wehurriedhome.
Hotmetal________asitgrowscooler.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Themorewelookedatthepicture,________.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
