__________lessons were not difficult.
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.
Why not stay at home ________ the road is so slippery after the heavy snow?
After a thorough search, the rescue team finally brought the mountain climber back, ________.