Couldn't confirm presence of Flash 7 or higher because JavaScript was disabled.
We highly recommend that you install Flash 7 or higher and that you enable JavaScript.
Get Flash ---
I really do have Flash installed.
What follows is a plain HTML version of the puzzle.
Book 27
Lesson 4
Across
1. a solid block of a substance
3. unpleasant noise that you hear on a radio, television, or telephone, caused by electricity in the air
5. a long thin bar or stick made of plastic, wood, or glass
7. a small metal or carbon object inside an electrical cell or a battery that electricity flows through
8. to make a fire or cigarette stop burning
13. a situation in which a machine or vehicle stops working
14. to force someone who is attacking to move back or to stop attacking
16. an electric light that you hold in your hand and point at things
Down
1. information about what has happened in the past that helps you to understand the present situation
2. at a very simple stage of development, before modern technology
4. a chemical substance with a ph value
6. a line of light or other form of energy
9. a period of 100 years, usually counted from a year ending in –00
10. to be pushed along very slowly by the movement of air or water
11. a piece of metal that can make iron or steel objects come to it so that they seem to stick to it
12. a long thin piece of something that forms rings or curls
15. one of the points on the very top or bottom of the Earth