You’re too tired. You _______ have a good rest.

—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?

“Passengers _____ not have their breakfast on the light train”. This rule arouses heated debates in Chongqing.

You _______ to tell him the news. It will make him sad.

(2013·江西高考)When I was a child, I ________ watch TV whenever I wanted to.