Try to make sentences about optical fibres with the matched word phrases from ex.10.

12. Do a crossword. What is hidden on the vertical highlighted line?

1.	Copper cables are usually about 120 ………………. in diameter.
2.	The speed limit in Russia is 90 kilometres …. hour.
3.	A pipe or a tube that carries liquid, gas, electric or telephone wire.
4.	To start to burn; to make something start to burn.
5.	The amount of something that a certain container can hold
6.	A line across a circle.
7.	To take something (ex. letters) to the place according to the address.
8.	An opposite to the word "easy".
9.	A line of pipes that are used for carrying liquid or gas over a long distance (usually underground).
10.	Amount of information that a particular computer network or Internet connection can send in a second.
11.	When you take something in your hand and move from one place to another; a synonym to "conduct" electricity.
12.	To control or manage something; to work with something; to deal with something (a problem, task, etc …); to touch with your hands.