1.The lions/feed/20 kilos of food a day.
PASSIVE: The lions are fed 20 kilos of food a day.
2. Corn/plant/in the middle of spring.
PASSIVE: Corn is planted in the middle of spring.
3. I/not allow/to stay up past 10.
PASSIVE: I am not allowed to stay up past 10.
4. George/not invite/to last week's dance.
PASSIVE: George wasn't invited to last week's dance.
5. The winners/will announce/very soon.
PASSIVE: The winners will be announced very soon.
6.Life/not discover/on Mars.
PASSIVE: Life wasn't discovered on Mars.
7.250 people/employ/the company.
PASSIVE: 7.250 people are employed the company.
8. French francs/not use/anymore.
PASSIVE: French francs aren't used anymore.