Evdence has been found through years of study______ children’s early sleeping problem likely to continue when they grow up.
It is still unclear ______ the little boy got the CD player to work.
—Ring me at six tomorrow morning, will you? —Why that early? I ____.
She tried two different methods, yet ______ of them seemed to work very well.
—What about ______ lecture you attended yesterday? —To tell the truth, it was too boring.I can’t stand ______ lecture like that.
He raised his voice, ______ we still couldn’t hear anything.