New Words：

creep [kriːp] v. 爬行；悄悄地缓慢行进；蹑手蹑脚地移动
crept [krept] creep的过去分词和过去式

Sample Sentences：

They began to creep up to the zebra.
She crept downstairs quiet as a mouse.
He crept into the house trying not to make a sound.
I crept up the stairs, trying not to wake my parents.

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