1. She awoke to the ringing of an electric bell.

2. The electric bell began to buzz for closing time.

3. She pressed the button of the electric bell.

4. He awoke to the ringing of electric bell.

5. Yes, there is an electric bell.

6. He awoke to the ringing of the electric bell.

7. He awoke to the ringing of an electric bell.

8. An electric bell is arranged in the circuit between each voice operated switch and the power supply.

9. By using the receptive relaxation reflex of the stomach as a basis, artificial conditioned reflex has been established with the sound of an electric bell or a metronome as indifferent stimulus.