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-eat a snake

You have eaten a snake.

We haven't eaten a snake. / We have never eaten a snake.

-swim in a cold lake

We have swum in a cold lake.

They haven't swum in a cold lake. / They have never swum in a cold lake.

-be on TV

My cousin Dan has been on TV.

You haven't been on TV. / You have never been on TV.

-go to another country

They have gone to another country.

Dolly hasn't done to another country.

-write a blog

I have written a blog.

You haven't written a blog.

-speak English outside class

Alex has spoken English outside class.

You haven't spoken English outside class.

-go scuba diving

The Simpsons have gone scuba diving.

The Browns haven't gone scuba diving.

1 An expedition is going to be prepared by John Mills to the North
2  видимо предложение не правильно написано
3 the expedition is going to be showed on national television
4 All the necessary have been already bought  by John Mills
5  An observation is going to be set up 
6 Objections have been raised to this expedition by many people

1 the project of a new trade centre is being discussed by the chief architects and engineers
2 all the necessary documents have been already signed by the general managers
3 building works are going to be started in April
4 the project will be supported by Many building firms 
5 the biggest trade and entertainment centre are going to be built in the region
6 objections have been raised to this project