我的手机掉进水里，正在下沉。

My phone fell into the water and is ___sinking.

随着股市持续下跌，投资者的信心正在逐渐减弱。

Investors' confidence is ___sinking as the stock market continues to fall.

我看到气球慢慢沉入湖底。

I saw the balloon slowly ___sinking to the bottom of the lake.

面对那么多债务，她开始感到绝望。

With so much debt, she started ___sinking into despair.