小男孩害怕打雷时紧紧抓住爸爸的手臂。

The little boy ___clung to his father's arm when he was scared of thunder.

保鲜膜紧紧贴在碗上，防止食物变干。

The plastic wrap ___clings tightly to the bowl to keep the food from drying out.

尽管医生建议戒烟，他还是固执地保持着这个坏习惯。

Despite the doctor's advice, he still ___clings to his bad habit of smoking.