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

“Isn’t it about time you _____ to do morning exercises？” “Yes, it is. Would you like to join us？” 

 Mr. Li, a man calling himself Smith wants to see you. ________ he come in?

It’s high time we _______ to the theater.

 —Did you tell Rose about the test? —Oh, no, I forgot. I          call her now.