The headmaster has retired but no one knows who will________him in the post.
_______environmental issues, the government will enforce existing regulations.
Eliza remembers everything exactly as if it _________ yesterday.
——Do you think it necessary that he ________ to Miami but to New York? ——I agree, but the problem is ________ he has refused to.
I told your friend how to get to the hotel, but I perhaps I __________ have driven her there.