Tenses in Passive Voice - Which one is correct?

The cows are milked / are being milked right now.

ARE BEING MILKED

A cinema is a place where films are shown / are being shown.

ARE SHOWN

Soap operas are watched / have been watched every day.

ARE WATCHED

When I arrived at the party, all the food has been eaten / had been eaten.

HAD BEEN EATEN

She discovered that all her jewellery was stolen / had been stolen.

HAD BEEN STOLEN

The room looks nice. It is cleaned / has been cleaned.

HAS BEEN CLEANED

My computer is repaired / has been repaired. It's working again.

HAS BEEN REPAIRED

Have you heard the news? The Prime Minister was shot / has been shot.

HAS BEEN SHOT

Many photos are taken / have been taken already.

HAVE BEEN TAKEN

A book was being read / was read this time yesterday.

WAS BEING READ

This house is quite old. It has been built / was built many years ago.

WAS BUILT

The paper clip is invented / was invented in 1899.

WAS INVENTED

The students told / were told to write an essay in the classroom.

WERE TOLD

Computer games will play / will be played tomorrow.

WILL BE PLAYED

Listen! My favourite song is being sung / is sung now.

IS BEING SUNG

English is being spoken / is spoken all over the world.

IS SPOKEN