There are quite a few old books on the shelf, but _____ of them is useful to teenagers.
—Why is Maria so nervous? Because she doesn't know ________at the big party.
—John is a hardworking student.---You’re fight.He play computer games,but he doesn’t do it now.
---Please say“I’m here.”when your name _________.---Yes,Mr Smith.
--- do you watch the English show on TV?---I watch it every day to improve my spoken English.
----In recent years,more and more Americans like traveling during holidays.---_______.