---Could I have a word with you, mum?  ---Oh, dear, if you______.

--Look! The girl passing by must be a newcomer!---No, she _______ be a newcomer. I’m sure it is at least one year since she came to live here.

--- 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?

I tried more than once to persuade the taxi driver to slow down, but he just __________ listen.

The boy insisted that he __________ nothing wrong and that he __________ at once.