Answer and Explanation:
The sentences we are changing are originally in the active voice. That means the subject of the sentence is the person/animal/object performing the action described by the verb. In order to change them to the passive voice, we must transform the object of the verb into the subject. We must also add the verb "be" adequately, which will help clarify that the subject now is not the one performing the action but the one receiving it.
1. Two people invited the celebrities to lot of dinners while they were in the UAE. ---> The celebrities were invited to a lot of dinners by two people while they were in the UAE.
2. The author wrote the script for the movie in 2019. ---> The script for the movie was written by the author in 2019.
3. Different film associations have given this production many awards. ---> Many awards have been given to this production by different film associations.
4. The producer chose Alain to film the beach scene. ---> Alain was chosen to film the beach scene by the producer.
5. Three people have bought thousands of tickets to see the film. ---> Thousands of tickets have been bought by three people to see the film.