__________ 舒适地;自由自在地
About 71 percent of the earth’s surface is c________ by water.
The writer was _____(教育)at a very good school.
He is not_____ (身体上地 )ill but mentally (思想上地) ill.
_____(生物化学)is very popular in science today.
The _____(本来的) owner of the house was the Duke of Wellington.