The lazy man ________ doing nothing all day.
---Cheer up! Have another go, OK? --- _____________.
Not until he met with the difficulty _______ the importance of group work.
Mary got the first prize in the National Math Competition, ________, for sure, delighted everyone.
______ he had broken the record, he would be a world-famous runner now.
—Was the driving pleasant when you vacationed in Mexico last summer? —No, it _______ for four days when we arrived, so the roads were very muddy.