单项选择题

Why did Cheng Ho go on his first voyage in 1405

A．He wanted to be the first to sail round the world.
B．He had to collect gifts and tributes for his emperor.
C．He was ordered to hunt the deposed former emperor.
D．He wanted to include the places he would cover into the Chinese territory.
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Tom is one of the boys who ______ on time.
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