The research lacks evidence, and therefore, its conclusions are doubtful.
--- Who should I send this message to ? --- The mayor is the one ___ ?
He transplanted the little tree to the garden _____ it was the best time for it.
Few pleasures can equal ______ of a cool drink on a hot day.
She is quite a different girl _____ she was five years ago.
—Did Jack come back early last night? —Yes. It was not yet eight o’clock _______ he arrived home.