当老师宣布明天放假时，全班同学都咧嘴笑了。

The whole class ___grins when the teacher announces a day off tomorrow.

当她看到自己考试得了满分时，得意地笑了。

She ___grins with satisfaction when seeing her perfect exam score.

虽然摔得很疼，他还是咧嘴笑了笑说自己没事。

Even though he fell hard, he ___grins and says he's fine.