2 If we get a taxi ,we will be there on time.
3 If you look in the fridge,I'm sure you wit find something.
4 He said if you boil water it will become steam(в этом случае нет правила согласования времен)
5 If I found someone's wallet in the street,I would give it to the police.
1. I have cooked dinner. I haven't cooked dinner.
2. I have cut my finger. I haven't cut my finger.
3. She has broken her arm. She hasn't broken her arm.
Ответ:
Now I want to give a talk about similar huge stones in Russia - Dolmens.
We can see them on Caucasus. They look like small houses of three monolithic stones. They are really heavy and nobody knows how people moved and lifted them. Last year some scientists tried to move the Dolmen to the other place. But they have failed it. The Dolmen just crashed to it's 3 stones.
Nobody knows who build it and when. Nowadays people use Dolmens like tourists attraction. They drive them to the place and tell them some stories about Dolmens.
That's all I wanted to say.
Большое приключение - (a) big adventure.