河水缓缓地流过山谷。

The river ___flows gently through the valley.

在非高峰时段，高速公路上的交通很顺畅。

Traffic ___flows smoothly on the highway during non-peak hours.

在头脑风暴会议中，想法应该自由流动。

Ideas should ___flow freely during a brainstorming session.