他们在咖啡馆里愉快地交谈了整个下午。

They happily ___conversed at the café all afternoon.

老师说‘努力学习才能取得好成绩’，其逆命题是‘取得好成绩是因为努力学习’。

The teacher said, 'Hard work leads to good grades,' and its ___converse is 'Good grades come from hard work.'