The new safety problem of contaminated(受污染的)milk is much more widespread, at least 22 dairy companies and their milk products that have appeared nationwide.
“I suppose you _____ that report yet?” “I finished it yesterday, as a matter of fact.”
I tried to phone her, but even as I _____ she was leaving the building.
The students _______ busily when Miss Brown went to get a book she _______ in the office.
I think you must be mistaken about seeing him at the theatre; I’m sure he _____ abroad all week.
They haven’t arrived yet but we _____ them at any moment.