—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?

——What ___ I wear for the party this evening, darling?——It's a formal dinner．

The art exhibition is really worth _______，and you’re sure to learn lot from it. 

 –Are you available at 3 tomorrow afternoon? --Sorry, I ________ a meeting at that time.

—We want someone to design the new art museum for us?—          the young fellow have a try?