The door _____ open, no matter how hard she pushes.

We can hardly believe such a young boy ______ travel around the world all by himself.

—Must I go there right now?
—No，you ________.You ________ go there before supper.

He ________ if he works hard for the people.

—Oh, my God！Our teacher is so mean!
—Calm down, my friend.Even though she is tough  sometimes, she ________ be nice if you really work hard.

It ________ have been her to leave her child alone and do whatever she wanted. She isn't such a person.

(2013·合肥一检)According to the rules and regulations, all payments ________ be made in cash in the shopping center.

Students ________ remain in their seats until all the papers have been collected.

(2013·北京东城二次联考)—________ you interrupt now？Can't you see I'm on the phone?
—Sorry，sir，but it's urgent.

No student______ go out of school for snacks during the break without the teacher’s permission.