passive voice

Put the sentences into passive voice. Mind the tenses.
They found oil in the North Sea.
Oil in the North Sea.

We should not leave litter about.
Litter about.

They built new houses in High Street last year.
New houses in High Street last year.

They sell sweets in this shop.
Sweets in this shop.

We should not pollute our environment.
Our environment .

They export electrical goods to other countries.
Electrical goods to other countries.

They produce planes in GB.
Planes in GB.

They export some products to Austria.
Some products to Austria.

They grow coffee in Brazil.
Coffee in Brazil.

They completed the Capitol in 1865.
The Capitol in 1865.