Кто ответит тому 50 рублей на счет(3.3.5

1 If the weather had been fine last week, we would have gone out. b)we should played tennis c) we would swum in the river. 2 If I came to Australia, I would be happy. b) I would have a nice house c) I would change my life 3 If I were the Presedent, I would  have stop the pollution.  b)I would reduce the car production. c)I I would control the waste disposal