He felt ______ to work for human rights and progress.
| A．it his duty | B．his duty | C．that is a duty | D．that is his duty |
A note was on the blackboard ______ “All those who have a fever must leave school right now”.
| A．on which was written | B．said | C．read | D．reading |
She felt sorry that she had disturbed the ______ calmness of a man she respected.
| A．regular | B．curious | C．usual | D．various |
—He ought to have been warned of the danger.
—______, but he wouldn’t listen to me.
| A．yes, he ought to | B．So he was | C．So was he | D．So it was with him |
All the task ______ ahead of time, they decided to go on holiday for a week.
| A．had been finished | B．were finished | C．having been finished | D．been finished |
—This wall of air is an effective answer to the problem and it ______ work.
—But it is a question to put such a wall of air around the statue.
| A．may | B．must | C．should | D．could |