(2013·天津高考)No one ________ be more generous; he has a heart of gold.

--Listen! Kate is playing the piano in the next room.　　--It _______________be Kate. She has gone to Hangzhou to visit the Cross-sea Bridge.

---- Daddy ,can you buy me a new MP3 when you go to Beijing?-----You ____ get one if you are admitted to a key middle school.

--The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?--________ my students have a try?

You      remind him to keep things neat and tidy, because he is well organized.