— 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.
I don't know if it ____ (rain) tomorrow. If it ______ (rain) tomorrow, I won’t climb the hills.
Joan and Mary haven't seen each other_____ they left school five years ago.
A talk on Chinese history _____ in the school hall next week.
—Is Xiao Li in the classroom? —No, hethere. I saw him in the reading room just now.
They arrived ___ London___ a cold winter night.