—Tony, you must have noticed the student who broke the glass.—I'm sorry.I________attentively.
China has hundreds of islands, ___________ is Taiwan Island.
You must have waited here for a long time ,___________you?
Nearly________ of the surface of our planet is covered by water.
It’s said that __________ is going to give us a lecture.
We had ___________ wonderful time_________the party_______ other day.