---Did you notice Tom was busy all day in his office?---Oh, yes, he has just finished his business tour of Chicago. He has a lot of work to ___.
Professor Smith ___ China yesterday.
I’m writing to you and ask whether you’d like to give us ___ how to learn English.
I wonder why he hasn't __ any of my letters for such a long time.
--Look! John is ___. Let’s go and see if he needs any help. A, out of the breath B. out of breath C. out of his breath D. out of breathes
It's dark, Mum ___ be waiting for my return.