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2. Fill each space in the sentences below using appropriate derivatives of the words in capitals in the correct form.

Like many ……… air bases, not used by the military forces, it is available to private recreational aviation during weekends.	ACT
The substance is easily dissolved in the water ……… .	SOLVE
Waves move at the speed of light in free space, but the speed of ……… through other materials is reduced according to equation.	PROPAGATE
If the ……… of gravity on Mars is 1/3 that on Earth, how many times longer does it take for a rock to drop the same distance on Mars?	ACCELERATE
……… problems are of interest to engineers, physicists and mathematicians because most physical systems are inherently alike.	LINE
The ……… of water increases between its melting point at 0 °C and 4 °C.	DENSE

POLYSEMY
1. For sentences 1 – 5 think of one word only which can be used appropriately in all three sentences.
1. a. The ……… limit in urban areas is usually 30 or 40 mph.
b. In addition to a dramatic increase in accuracy, this scheme also offers significant advantages in computational ………, since the calculation only requires a pair of summations.
c. The ……… of light is 300 million metres per second.
2. a. They help you talk through your problems but they don't give you any …….
b. The chamber is initially filled with glucose …........
c. The value of X can be obtained from the ……… below.
3. a. As an example, when oil reacts with oxygen, potential ……… is released, since new chemical bonds are formed. The released ……… resulting from this process may be converted directly to electricity with good efficiency.
b. The ……… generated by the windmill drives all the drainage pumps.
c. I was so tired, I didn't even have the ……… to get out of bed.
4. a. The doctor took my ……… and said it was rather weak.
b. The data, normally transmitted electronically, can be changed into ………s of light.
c. The situation changes daily, so you've got to keep your finger on the ……...