Question

did the river...into the sea?-no, it didn't. it ... into the lake (слова которые нужно вставить в место ...) border,chain,coasts,flow,flows,flowed,stretch,plains,perfect,valley,lilies-of-the-valley

Answer 1

Одно слово
fall и fall

Answer 2

Did the river flow into the sea? No, it didn't. It flowed into the lake.

In this context, "flowed" is the appropriate word to use. The sentence would read:

"Did the river flow into the sea? No, it didn't. It flowed into the lake."

So, the completed sentence would be: "Did the river flow into the sea? No, it didn't. It flowed into the lake."