随着夜幕降临，气球慢慢降落到地面上。

As night fell, the balloon slowly ___sank to the ground.

石头太重，直接沉到了水底。

The stone was so heavy that it quickly ___sank to the bottom.

随着夜幕降临，城市的噪音逐渐减弱。

The city noise ___subsided as night fell.

他们把大量资金投入了这个房地产项目。

They ___sank a huge amount of money into this real estate project.

我的手机掉进河里很快就沉下去了。

My phone fell into the river and ___sank quickly.

随着冬天的临近，气温逐渐下降了。

The temperature ___sank as winter approached.

他们投入了大量资金来翻新这家老餐厅。

They ___sank a fortune into renovating the old restaurant.

当她看到考试成绩时，心情一下子跌到了谷底。

Her spirits ___sank when she saw the exam results.