选词填空：将edge, border, rim, verge?放到合适的位置，完成句子。

This is the north ______ of the field.

The plane flew across the ______.

He wears a pair of spectacles with gold ______.

She was on the ______ of speaking out the secret.

点津：

edge, border, rim, verge这组词皆有“边，边缘”之意。

edge通常指某物一边的边线、两个平面的交界线以及各种界线，其引申含义表示两个处于不同性质或状态之间的明显界线，特指处在不利状态下的边缘。?

border意为“边界，边境，国境”，也可以指装饰周边的“边”。?

rim意思是“边，边缘”，尤指圆形或近似圆形的物体的边缘。?

verge特指道路、花坛等长着草的“边缘”。

This is the north edge of the field.

这是这块地的北边线。?

The plane flew across the border.

飞机飞越了边境。?

He wears a pair of spectacles with gold rims.

他戴一副金丝边眼镜。?

She was on the verge of speaking out the secret.

她差点儿把秘密说出来。

答案： edge, border, rims, verge?