Réponse:
1:gun powder will have been invented by the Chinese. 2:a speech will have been given by the President tonight .3:severe damages have been caused by pollution. 4:His car has been stolen five times by thieves,. 5:Millions of litters of wastes have been dumped into rivers and oceans by factories,. 6':A surfer had almost been killed by a shark at bondi beach. 7:300 people have already been fired by this manager. 8:smoking kills millions of people yearly. 9':this bridge had been built by a famous architect in 1602.10:A new cinema will have been opened by Mr Dean next week.11:I had been told by my boss not to come the following day.12:we have been given a pay rise by our company