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                                    Fill in the blanks:1. It is a belief that …………….. was the first metal to come into use. 2. Actually, ……. Was the first metal to be used. 3. ……………could not be used to make tools and implements. 4. The invention of the …………….. is the most important invention. 5. The ………… was first used by potters. | 
                            
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Answer»  1. copper 2. gold 3. gold 4. wheel 5. wheel  | 
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