are short of 

is often thought
have became

 

Some of the old Russian historic churches have become ruined by time.

A smart fridge will keep an eye on the quantity and quality of food stored in it and automatically notify the nearest shop if you are short of fruit of milk.

Although the story of the Tower of Babel is often thought to be purely a myth, there are archaeological indications that a tower really existed in the ancient city of Babylon.