You      drink wine before driving, or the police will take your license away.

—Must I take much medicine every day?—No, you ________.

—Why can your neighbor know so much about London?—He ____ have been there before.

The train is to start soon and Mary hasn’t turned up． What _____ have happened to her?

—Do you know where Mary is? I couldn’t find her anywhere.—Well . She        have gone far—her coat’s still here.