6. Change the following sentences from passive to active form. Keep the same tense with each change.  Use any suitable subject:

1. This mountain has never been climbed before. 2. She told me that those newspapers had been carefully put away. 3. Why have these cups been put here in this cupboard? 4. After Nick had been told to go home at once he hurried there.

5. Invitations have been sent to all famous people of the city. 6. This play will be staged at the beginning of the next season. 7. A new concert hall is being built in our street now. 8. Have the rules of the game been explained to you?