1. The ____ of the experiment was not possible to guess. 2. The ____ of this material is the cost 3. Over 100,000 kilometres, this vehicle had no ____. 4. There is a ____ between the performance of the engine and the need for it to be economical. 5. The ____ was made when he was working late in the laboratory one night. 6. Even though it had a number of ____, the first design was chosen.

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