Not until all the fish in the river died _________ how serious the pollution was.[ ]

The scientist’s many years’ careful observation ____ a surprising discovery.

Once our supplies _______, we will take the risk of starving to death.

It’s reported that nearly150,000 people lost their lives in Asian tsunamis(海啸).　　—Yes, ______ news cameas _____ shock to me.

About of the students in our school were born in the .