____ is certain, though, is that “the curse of the mummy” remains a riddle to this day

Do you know ________ this dictionary belongs to—Let me see. Oh, it’s ________.

What will you do if you have two days_______ — I’d like to go_______ a trip to Suzhou.

Heads from Asia and Europe attended the conference and President Hu ________ a speech on thefirst day.[ ]

I objected ________ for a walk on such a cloudy day .[ ]