Copy the exercise to your notebook, then answer.
Read each sentence. Look for context clues to help you complete each sentence with a word from the list. Write the word on the line.
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1-In today’s ______ society, most work is done by machines.
2-But as more power is needed, people have _____, or altered their ideas about possible energy sources.
3-Paul MacCready had an idea for an airplane that used the sun’s energy and its own _____ energy, the energy of motion, for its power.
4-MacCready had been working slowly on the plan for several years, but when the energy shortage began in the 1970’s he ______ his efforts.
5-Called the Solar Challenger, this ______ had only one set of wings.
6-Unlike planes built of heavy materials, the Solar Challenger was made of a _______ plastic and weighed only 217 pounds.
7-Special energy cells collected the solar energy and converted it to to electricity, which was _____ to the engine.
8-The test pilot flew the plane at a height of 11,000 feet, as measured by the _____, the altitude gauge in the plane.
9-The successful flight of the Solar Challenger proved that people can _____ or control and use the sun’s energy.
10-But solar energy is _______ only when the sun shines!
TAREAS: Colegio La Paz 