PDF chapter test TRY NOW

Read the sentences. Choose the right word or phrase for these definitions.
 
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1. A place where the production of the energy is released when the nucleus (= central part) of an atom is divided: 
    
 
2. Places have no one in it:
   
 
3. Hydroelectric ​power (= the ​production of ​electricity by the ​force of ​fast ​moving ​water):