___has taught us that failure is the mother of success.

A. Experience　　　 B. Practice　　　　 C. Action　　　　　 D. Thoughts

—Has anyone taught him how to do it?

—Sure. Lots of advice________, but he hasn’t made a decision.

A. gave      B. was given   C. have been given   D. has been given

249. A_____ has taught us what atoms are made up of and how powerful the atom bomb is.

249. A_____ has taught us what atoms are made up of and how powerful the atom bomb is.

 A.seaman                 B. salesman               C. naturalist                    D. Scientist

A_____ has taught us what atoms are made up of and how powerful the atom bomb is.

   A. seaman            B. salesman               C. naturalist             D. scientist