Will you go to Mary’s birthday party?—No, ____ invited, I can’t go to it because I’ll be too busy then.

It was at 5 o’clock __________ the visitors finally arrived at Pudong International Airport.

It is _______ unusual thing for us to find ________ UFO.

Look! The boy is running fast! –He might ______ to catch a bus.

About 56 ____ people live in this country.