1. поставьте все типы вопросов к предложению. the houses of the station were built on the river kamchatka over 30 years ago.

Were the houses of the station built on the river Kamchatka over 30 years ago?
were the houses of the station built on the river Kamchatka over 30 or 50 years ago?
The houses of the station were built on the river Kamchatka over 30 years ago, weren't they?
when were the houses of the station built on the river Kamchatka?
what was built on the river Kamchatka over 30 years ago?