Look! Is that man Mr. Li–No, it ______ be him. He has gone to America for a meeting.

So when did you meet Joan —It was last Sunday _______ she came to visit my sister.

The music he is playing sounds_____.

st summer vocation in the high school, _______Ispent a fortnight on the farm, is really unforgettable.

There ______ a school trip this weekend. We will have a great time.