Change the following sentences, using the verbs in the Passive Voice
They will leave a message for you.
Who discovered America?
She did not post the letter yesterday.
The teacher corrected our exercises.
The Dean greeted all the freshmen.
Students must return these books to the library.
You can finish the work in three days.
They will not tell Ann about it.
We broke the window yesterday.
He wrote the letter long ago.