他的数学成绩比上学期更差了。

His math grades are ___worse this semester than last.

天气变得更糟了，我们不得不取消野餐。

The weather got ___worse, so we had to cancel the picnic.

天气越来越糟了，从下雨变成了暴风雪。

The weather went from bad to ___worse, changing from rain to a snowstorm.