新窗帘让整个房间变得更明亮了。

The new curtains ___brightened up the whole room.

老师讲了个笑话，教室里的紧张气氛顿时轻松了许多。

The teacher told a joke and the tense atmosphere in the classroom ___lightened immediately.

她取消了几个会议，减轻了自己的工作负担。

She ___lightened her workload by canceling a few meetings.

这件T恤洗过几次后颜色变浅了。

The color of this T-shirt ___lightened after a few washes.