小男孩皱着眉头，艰难地咽下了苦药。

The little boy frowned and had trouble ___swallowing the bitter medicine.

我很难接受他站不住脚的借口。

I find it hard to ___swallow his lame excuse.

她强忍着泪水，继续讲完了故事。

She ___swallowed her tears and finished telling the story.