40．-- How much do I owe you for lunch?

　　　 -- ________ ．It’s nothing．

　　　 A．Come on　　 　　 B．Go ahead　　 　　 C．With pleasure　 D．Forget it

39．It was not until she got to the classroom ________ Lily realized she had left her textbook in the dormitory．

　　　 A．that　　　 　　　　　 B．where　 　　　　　　 C．when　　 　　　　　 D．before

38．They made a great effort to prepare the exhibition, ______ to achieve a big success．

　　　 A．hoped　　 　　　　　 B．hoping　 　　　　　 C．to hope 　　　　　　　 D．hope

37．If I can help ________ , I don't like working late into the night．

　　　 A．so　　　　　 　 B．that　　　　　 　 C．it　　　　　 　　 D．them