15. _______ the day went on, the weather got worse, which made it impossible for them to go down the mountain.
After 15 years in the USA, he has finally decided to _____ American citizen-ship.
—Why not take my car to the museum instead of walking? —No, thanks, ______.
Due to cultural differences, most artists find it hard to ______ Chinese crosstalks to westerners.
Was it in the garden ____ we used to work in ____ the famous actors and actresses had a picnic?
Tom _____ full marks, but he was too careless and made a spelling mistake.