Smoking _______________ (not allow) on planes.
is not allowed
This tree is very old. It ___________________(plant) in the 19th century.
was planted
The boy killed the spider.
The spider was killed (by the boy)
This photo __________________(take) by my grandfather when I was five.
was taken
People use phones every day.
Phones are used by people every day.
Where did they invent gun powder?
Where was gun powder invented?
A spokesman gave an interview to the reporters.
The reporters were given an interview by a spokesman.
The secretary opens the mail every morning.
The mail is opened by the secretary every morning.
The children rang the bell a few minutes ago.
The bell was rung by the children a few minutes ago
They clean the windows every week.
The windows are cleaned every week.
I feed my cat three times a day.
My cat is fed three times a day.
My grandmother made the cake yesterday.
The cake was made (by my grandmother) yesterday
People eat 40 million hamburgers every day.
40 million hamburgers are eaten every day.