1.
On the Waves, p. 7
Drive, February 2015
Fill in the gaps with a verb in the correct form.
Microwave ovens _________________________ (be invented) 70 years ago. Since then, they
____________________ (become) an important piece of kitchen equipment. In the 1940s,
Percy Spencer, an American engineer, ________________________ (build) radar equipment and ________________ (notice) that a chocolate bar he had in his pocket _______________
(start) to melt. He __________________ (test) his idea by making popcorn and exploding an egg. He _________________ (invent) the principle of microwave ovens.
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2.
On the Waves, p. 7
Drive, February 2015
Number the sentences 1 – 4 in the right order.
How microwaves heat food
_____ They begin to rotate rapidly as the alternating electric field passes through them.
_____ That rotation heats up the food.
_____ Most microwave ovens hit food with microwaves at a wavelength of 12.24cm.
_____ The molecules in the food, particularly water, absorb energy from the waves.
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3.
On the Waves, p. 7
Drive, February 2015
Write the words into the correct box: rotate, rotation, explode, explosion, invention, invent, equip, equipment, absorption, absorb, interact, interaction,
suggestion, suggest noun verb

1.
On the Waves, p. 7
Drive, February 2015
Fill in the gaps with a verb in the correct form.
Microwave ovens were invented 70 years ago.
Since then, they have become an important piece of kitchen equipment.
In the 1940s, Percy Spencer, an American engineer, was building radar equipment and noticed that a chocolate bar he had in his pocket started to melt. He tested his idea by making popcorn and exploding an egg. He invented the principle of microwave ovens.
 ----------------------------------------------------------------------------------------------------------------------------------
2.
On the Waves, p. 7
Drive, February 2015
Number the sentences 1 – 4 in the right order.
How microwaves heat food
__ 3 __ They begin to rotate rapidly as the alternating electric field passes through them.
__ 4 __ That rotation heats up the food.
__ 1 __ Most microwave ovens hit food with microwaves at a wavelength of 12.24cm.
__ 2 __ The molecules in the food, particularly water, absorb energy from the waves.
 ----------------------------------------------------------------------------------------------------------------------------------
3.
On the Waves, p. 7
Drive, February 2015
Write the words into the correct box: rotate, rotation, explode, explosion, invention, invent, equip, equipment, absorption, absorb, interact, interaction,
suggestion, suggest noun verb rotation, explosion, invention, equipment, absorption, interaction, suggestion rotate, explode, invent, equip, absorb, interact, suggest