—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 grandparents love the children, they are strict with them.
_______ the punishment was unjust, he accepted it without complaint.
He is better than _______ I last visited him.
Why do you want a new job ____ you’ve got such a good one already?
Don’t play by the river _______ you fall in and drown!