4. It was _____ windy morning but they hired _____ boat and went for _____ sail along the coast.
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5. He is _____ expert in Chinese history but he is also interested in the history of Japan.
6. The machine for converting mechanical energy into electrical energy is called _____generator.
7. _____ oral agreement is not enough; we must have _____ written promise.
8. We need to buy _____ tourist handbook before going traveling.