4.That officer announced that the meeting was delayed until next week.

-> The meeting was announced to have been delayed until next week by that officer.

5.He discovered that this cotton was grown in Egypt.

-> This cotton was discovered to have been grown in Egypt.

6.They promise that the performance will start on time.

-> It is promised that the performance will start on time.

7.He recommends that we should stay at the city center.

-> It is recommended that we should stay at the city center.

8.We believed that Alice would pass the driving test.

-> It was believed that Alice would pass the driving test.

9.The director notifies all the workers that they will have to work extra hard this month.

-> All the workers are notified that they will have to work extra hard this month by the director.

10.They have persuaded me that they will go with me to the stadium.

-> I have been persuaded that they will go with me to the stadium.

11.They have decided that the company will go to the beach together at the weekend.

-> The company has been decided to go to the beach together at the weekend.

12.People think that Maradona is the best football player in the 20th century.

-> Maradona is thought to be the best football player in the 20th century.

13.They find that the job is not suitable for a girl like her.

-> The job is found to be not suitable for a girl like her.

14.The teacher explained that this powerful engine pulled the train.

-> It was explained that this powerful engine pulled the train.

15.He told me that his football team had played well last season.

-> His football team was told to have played well last season.