Definition: to move very quietly and carefully Level: C2
那只猫从敞开的窗户悄悄爬了进来。
The cat ___crept in through the open window.
她沿着走廊悄悄移动，以免吵醒任何人。
She ___crept along the corridor so as not to wake anyone.
在黑暗的掩护下，间谍悄悄溜出了敌人的营地。
Under cover of darkness, the spy ___crept out of the enemy compound.
