我看到一条蛇从岩石上蜿蜒而下。
I saw a snake ___slither down from the rock.
小偷溜进了黑暗的走廊。
The thief ___slithered into the dark hallway.
蛇在草地上蜿蜒前行。
A snake was ___slithering through the grass.
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