Volunteering gives you a chance _______ lives，including your own．
A．change B．changing
C．changed D．to change
The news came as no surprise to me．I _____ for some time that the factory was going to shut down．
A．knew B．had known
C．have known D．know
Dan Brown，_____ author of The Da Vinci Code，is _____ very famous American writer．
A．a; the B．the; the
C．the; a D．a; a
Jack，it’s too hot here．______ I open the window？
A．Shall B．Will C．Should D．Would
_____ he promised that he wouldn’t be late，he didn’t arrive until the end of the party．
A．Since B．Although
C．Because D．Until
Since the new speed limits ______，the number of accidents in the area has fallen strikingly．
A．were introduced B．introduced
C．have been introduced D．have introduced
