Put in words from exercise I your homework: 1. is a substance that allows hear or electricity to go through it.
2. is a person who mines for gold (= removes it from under the ground )
3. a book containing a simple simple story that is designed for children who are learning to read or people who are learning a foreign language.
4. the past of a radio, television or computer or a piece of electrical equipment for playing recorded sound through which the sound is played. There is sound coming out of the right - hand
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