---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?

The boss ordered that the work ______ right away.

 It’s a very kind offer, but I really _____ accept it. 

—How did your mathematics exam go？—I thought I           ，but in fact I fell behind in the class.

 That car nearly hit me; I ______.