——The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job? ——____ Tom have a try?
Each of the students _____ a Chinese-English dictionary.
Mathematics ____the language of science.
Half of his goods ____ stolen the other day.
That they were wrong in these matters _____ now clear to us all.
Although the first part of the book is easy, the rest ______.