It has been announced that students _______ remain in their seats until all the papers have been collected.

According to the rules of Daddy, where are we going?, nobody _______ take along with them cash and cell phones.

I’m impressed with his determination. When he had a problem to solve, he  _____ work at it until he found an answer.

 ----You needn’t take an umbrella. It isn’t going to rain.----Well, I don’t know. It_____do.

– Must I finish my work today?-- No, you _______.