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Match the words below with their definitions. There are four extra words.

Write one word in each gap.

research, inventor, machine, permission, crowd, experiment, field, heat, height, power



The temperature of something (usually high). (n)

It has got several moving parts and uses power to do a particular type of work. (n)

The act of allowing someone to do something. (n)

To study a subject in detail. (v)

The distance from the top to the bottom of something. (n)


Physical strength or electricity. (n)