_________ to sunlight for too much time will do harm to one’s skin.
___ new products have been successfully made in the factory.
Either you or I __ to blame for this.
--Was the driving pleasant when you vocationed in Mexico last summer? ----No, it ___ for four days when we arrived, so that the roads were very muddy.
Most of us think that the ocean bottom is ___ smooth land.
--Our guests are coming from Shanghai at 10:30.---Oh, I ___ it ___11:30.