Scientists don’t often make ____ that are this important. There is a ____ between making the battery bigger and increasing the weight of the product. The ____ of the experiment was not possible to guess. The ____ of the modifications was an increase in the product’s efficiency. Even though it had a number of ____, the first design was chosen. The biggest ____ of the product was its reliability. Over 100,000 kilometres, this vehicle had no ____. There is a ____ between the performance of the engine and the need for it to be economical.

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