— Who’s that man in our classroom? It ________ be Mr. Brown. He is much taller.— You mean the man in white? He is an exchange student from England.

It is recommended that the project ________ not be started until all the preparations have been made.

—Have you decided when to leave for Australia?—Not yet. We _________ set off at the end of this month.

Days later, my brother called to say he was all right, but _______say where he was.

---I was told to be here at this time.---Sorry, you ___________. I forgot to tell you we've changed the plan.