Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Hardlyhadhefinishedhisspeech________theaudiencestartedcheering.
Hotmetal________asitgrowscooler.
Hefellasleepimmediatelylastnight;hemust________(be)verytired.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Tosucceedinascientificresearchproject________.
