土豆和米饭富含淀粉，是我们日常能量的重要来源。

Potatoes and rice are rich in ___starch, which is an important source of daily energy.

为了让桌布更挺括，她在洗完后加了淀粉。

To make the tablecloth crisper, she added ___starch after washing it.

他礼貌但刻板的举止让气氛变得有些拘谨。

His polite but ___starchy manner made the atmosphere a bit stiff.