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- The two presidents maintained a close ______ despite their rival businesses.
2. Efforts were made to _______ train track width across Europe in the late twentieth century.
3. The program seems easy to use, but the interface needs to be _______.
4. The machine could become dangerous if it is _______.
5. He transferred from the parent company to one of its smaller _______.
6. To resolve their differences, they employed an ________ to deal with the two sides.