This painting of his had been _____by some experts of the world.

My teacher inspired ____ a summer course to improve my writing skills. [ ]

Many beautiful fish are disappearing____ the severe(严重的) pollution.

I want to buy the book ‘The old Man AndThe sea’. Do you know its_______ — Not very clearly, Maybe fifty yuan.

to the application of new farmingmethods, the out put is now _____ it was before the year 2000．