--__________ we make it half past seven? --What about _______ it a little earlier?
________ 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.
Once ______ , the plan can’t be changed.