1.If you had bought this book in september, you would not have been waiting for it in lybrary
2.I cannot say now wether he arrives in our city or not
3.If people care about enviroment, they will not have to worry about global warming
4.If these jeans were made in China, they would be cheaper.
5.As soon as he wakes up, he checks out his mail
6.If your friends had gone with us, we would have had great time. I will offer them ti do it.
Я надеюсь, что это правильно)