John, as well as the other children who _____ no parents, ________ good care of in the school.
The water ________ cool when I jumped into the pool for morning exercise.
—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)