Tom,you and I could hardly work out the mathematic problem, _______?
When the party was over, he ______ his friends good-bye and ______.
________ doesn’t seem to have been any difficulty solving the problem.
Joan had often heard ____ said that Marley had no money.
Carl Linnaeus made great contributions to ________ plant species.
He observed a stranger _______ around the store at 12 p.m. last night.