Ex.12 Translate the sentences paying attention to conjunctions.

1. Between conductors and insulators there are many materials which are neither good conductors nor good insulators.

2. Neither of the engines will give the efficiency desired.

3. In many cases heat plays an important role, either starting or accelerating a chemical reaction.

4. Either of the methods of producing electricity may be used under these conditions.

5. There is no doubt that both magnetic and electrostatic forces play a part in the formation of all molecules.