Who cleaned the classroom—Mary________.

We have been informed that he had done_____ visits were essential by eleven o’clock last night. [ ]

The new shopping mall _____________ for a month, but I haven’t been there once.

You have written your book report _____ one hour. Have you finished it—Not yet! But I think it is due _____ one hour.

If you had studied hard at that time, you ____________ a university student now.