Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Iwonderifhecouldgetit________(do)beforetomorrow.
Seniormembersofthestaffcompetedeagerly________thepositionofsalesmanagerinthecompany.
Hethoroughlyunderstoodthesociety__________.
设数列收敛，则（）
