如果他们不小心，他们将会陷入麻烦。

They'll ___be ___heading ___for trouble if they're not careful.

这个国家正走向经济衰退。

The country ___is ___heading ___for a recession.

如果我们不改变习惯，我们正走向环境危机。

If we don't change our habits, we ___are ___heading ___for an environmental crisis.