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.

A message will be left for you. Who was America discovered by? The letter was not posted by her yesterday. Our exercises were corrected by the teacher. All the freshmen weer greeted by the Dean. These books must be returned by students to the library.The work can be finished by you in three days. Ann will not be told about it. The window was broken by us yesterday. The letter was written by him long ago.