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1. Travelling on helicopter is exciting.
2. We have ever been live in Belarus for 3 years.
3. None of his parents realized the danger.
4. There are not seats enought for everubody.
5. His advice are usually useful.

By вместо on. Travelling by helicopter...ever лишнее have been living. We have been living in..No one. No one of his parents realized the dangereverybody and enough. There aren't enough seats for everybodyHis advice is usually useful. или His advices are usually useful