We were busy ________ (get) things ready for the trial production when he phoned us.
getting
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Thedirectorrecommendedthatshe________(study)moreEnglishbeforegoingabroad.
Hefellasleepimmediatelylastnight;hemust________(be)verytired.
Themorewelookedatthepicture,________.
You________gonow.It’sgettinglate.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.