猫看到陌生人时会蹲下身子，保持警惕。

The cat ___crouched down when it saw the stranger, staying alert.

猫咪蹲伏在草丛中，准备扑向那只蝴蝶。

The cat ___crouched in the grass, ready to pounce on the butterfly.

小猫蜷缩在沙发下面躲避雷声。

The kitten ___crouched under the sofa to hide from the thunder.

那只猫蜷缩在沙发下，害怕外面的雷声。

The cat ___crouched under the sofa, scared of the thunder outside.