40．--The weather is fine．Why not fly a kite in the park this afternoon?

-- ________．I have to babysit my little sister．

A．Sounds like a good idea　　　　　　　　　　　　　　　 B．I'd like to

C．I'm afraid I can't

39．--Do you know ________ the MP4 player last Sunday?

--Sorry，I have no idea，

A．How much did She pay for　　　　　　　　　　　　　 B．How much she paid for

C．How much had she paid for

38．I don't like bread，I won't eat it ________ I am very hungry．

A．when　　　　　 　　 B．unless　　　　　 　 C．if