Помогите пожалуйста, срочно!!!

The office is cleaned every evening at 5:00
Trees are planted in the forest.
The summer olympics are held every four years.
Was America discovered in 1492?
The road is closed due to an oil spill.
The party invitations were sent yesterday afternoon.
He will be awarded a Nobel prize.
Were the plants watered?
A dolphin was seen swimming in the sea.
The package should be handled carefully.
The tax is included in the bill.