如果你现在离开学校，你所有的努力都将付诸东流。

If you leave the school now, all your hard work will go ___down ___the ___drain.

我想，所有那些晚上的谈话和10万日元的投资都打水漂了。

All those evening conversations and the investment of 100,000 yen went ___down ___the ___drain, I thought.

我们投资在那个失败项目上的所有钱都浪费了。

All the money we invested in that failed project went ___down ___the ___drain.