Thedirectorrecommendedthatshe________(study)moreEnglishbeforegoingabroad.
Agreatnumberofsmallpowerstations________(setup)intheircounty sinceliberation.
Iwonderifhecouldgetit________(do)beforetomorrow.
Wooddoesnotconductelectricity;________.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Howlong________they________(dig)theditch?