heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Ipreferthisdiagram________thatone.
He refused to tell us whether he ________ (undertake) the job.
Night________(fall),wehurriedhome.
Hardly had he finished his speech ________ the audience started cheering.
Ihavebeenstudyinghereforfouryears,bynextsummerI________.
