她扣上了外套的纽扣。

She did up the ___button on her coat.

这条裙子的前面有一个装饰性的纽扣。

The dress had a decorative ___button on the front.

他衬衫上掉了一颗纽扣，不得不缝回去。

He lost a ___button from his shirt and had to sew it back on.