a must, Visiting the Eiffel Tower is ___ for anyone travelling to Paris., brainwave, I couldn't solve the problem until I had a sudden ___ and saw the solution instantly., break with convention, The new architect decided to ___ and design a house with no straight walls., come at the problem from a different angle, If the initial approach isn't working, try to ___ ., endurance, Marathon runners require incredible ___ to run for over 26 miles., erratic, The car's temperature gauge was ___ , fluctuating wildly between hot and cold., focus, The main ___ of the lecture was on sustainable energy sources., had a flash of inspiration, As the deadline approached, the designer suddenly ___ for the new logo., imperceptible, The change in air pressure was so small it was ___ to the human body., indispensable, A good pair of comfortable shoes is ___ for a long hiking trip., offcuts, We used the carpet ___ to make small protective mats for under the chairs., pre-requisite, Completion of the introductory course is a ___ for enrolling in the advanced class., tannery, The old ___ smelled strongly of chemicals used in the process of turning animal skins into leather., well up, When she heard the beautiful music, she felt tears start to ___ in her eyes., win the competition hands down, With his flawless performance, he was sure to ___ .

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