You ______be tired after working for eight hours without ______ a rest.

 Whether dying patients      be helped to end their lives is a tough moral question.

-----Who has made a mess in my room? -----Who else         it but your naughty son?

If the students who killed themselves had only been more confident, their deaths ________.

—Must I go through the radiation (辐射) check when I come back from Japan at the airport these days?—Yes, you ______.