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II. 语法填空：（共10题，每小题1.5分，共15分）
From the beginning of human history, information traveled only as fast as a ship could sail. Or a horse could run. Or a person could walk.
People experimented with other ways to send messages. Some people tried 16 (use) birds to carry messages. Then they discovered it was not always 17 safe way to send or receive information.
From the beginning of human history, information traveled only as fast as a ship could sail. Or a horse could run. Or a person could walk.
People experimented with other ways to send messages. Some people tried 16 (use) birds to carry messages. Then they discovered it was not always 17 safe way to send or receive information.
