他每天用哑铃锻炼手臂肌肉。

He uses ___dumbbells every day to strengthen his arm muscles.

他每天用哑铃做二头肌弯举。

He does bicep curls with ___dumbbells every day.

别像个傻瓜一样站在那里，快来帮忙！

Stop standing there like a ___dumbbell and come help!