For centures it was thought that mercury (ртуть) wasn't poisonous. (For centuries mercury wasn't ... )  - For centuries mercury wasn't thought to be poisonous. , It is known that the universe is about 13.7 billion years old. (The universe is ...)  - The universe is known to be about 13.7 billion years old., It is thought that there are fewer than 500 Siberian tigers living in the wild. (There are ...)  - There are thought to be fewer than 500 Siberian tigers living in the wild. , In the 16th-century England taking a bath was considered to be unhealthy. (In the 16th century in England it was ...)  - In the 16th-century England it was considered that taking a bath was unhealthy. , The Chinese are thought to have invented tea. (It is ...) - It is thought that the Chinese invented tea. ,

PRACTICE: Advanced passive structures

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