—Jim，you said you'd lend me your MP5.—I'm sorry I forgot my promise but you ________ have it next Saturday. 

There was something wrong with the network，or the e-mail____ earlier.

Our playground is not so tidy and beautiful as before, students must ____ dirty things on it.  

The new supermarket announced that the first to purchase goods on the opening day_______ get a big prize.

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