At times the balance in nature is ______, resulting in a number of possibly unforeseen effects.
Volunteering gives you a chance _______ lives,including your own.
The news came as no surprise to me.I _____ for some time that the factory was going to shut down.
Dan Brown,_____ author of The Da Vinci Code,is _____ very famous American writer.
Jack,it’s too hot here.______ I open the window?
_____ he promised that he wouldn’t be late,he didn’t arrive until the end of the party.