Aunt Tina will visit us soon. _______ is arriving tomorrow morning.
You’re late! You were ____to be here an hour ago.— Sorry, Mr. Hu.
Look at the boy running on the ground. Is it Davis?—It ______ be him. I saw him go to the teacher’s office just now.
What are you doing there?—I’m going hiking _______ the mountains. I like going there _______ vacation. [ ]
Who are you going to havethis letter for you?—-My secretary.