Question

Passive Voice
Animals in the zoo....(feed) 3 times a day.
Ink......(use) for writing many years ago.
The book of this writer.........(publish) in a month.
We...(not invite) to Andrew's party last year.
Flowers....(to sell) in shops and in the streets.
St.Petersburg.......(to found) in 1703.
Bread......(to eat) every day.
The letter.....(to receive) yesterday.
Nick.......(to send) to Moscow next week.

Answer 1

are fed
was used
will be published
weren't invited
are sold
was found
is eaten
was received
was sent