Passive : advanced structures

Prosím prvé cvičenie aj druhé. Ďakujem

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Ahoj, 1- je všetko na pasívum s danými slovíčkami
1-are known to have been early human settlements
2-is known that soldiers in the ancient Roman army received
3-was thought that salt was
4-is thought to have been one of the factors
5-is believed to have
6-believed to be health problems
vždy to musíš upraviť len tak, aby to do vety sadlo ako celok (podľa toho akým slovíčkom začína/končí... :)