Mary said it was at least five years since he ______ a good drink.
—What's that noise? —Oh,I forgot to tell you.The new machine ________.
—Why does the lake smell terrible? —Because large quantities of water ________.
His sister left home in 1998,and ________ since.
In the near future,more advances in the robot technology ________ by scientists.(2011·湖南)
John, a friend of mine, who got married only last week, spent $3,000 more than he ________ for the wedding.