3. перепиши предложения в passive voice. 1. they offered tourists a free sightseeing tour. 2. mr. broun is dictating a letter to his secretary. 3. they had signed the contract by the end of the month. 4. they will exam the students in may. 5. the police arrested his friend. 6. the visitors can see the world’s public wax figures. 7. marie carried out the research under great difficulty.

Tourists are offered a free sightseeing tour.
A letter is being dictated by Mr. Broun.
The contract had been signed by the end of the month.
The students will be examined by them in May.
His friend was arrested by the police.
The world's public wax figures can be seen by the visitors.
The research was carried out under great difficulty by Mary.