What a fast learner he was! He_____ a lot of French when he lived with the native.
Misunderstandings __________ from lack of social communication, unless __________ properly, may lead to serious problems.
All the branch companies are __________ the members of the family.
Even though they were much younger, we treated them __________ equals.
__________ on their own efforts, they overcame all the difficulties and finished the task ahead of time.
Tom can't have received the invitation; otherwise he __________ your birthday party yesterday.