—Why is Maria so nervous? Because she doesn't know ________at the big party.
—The problem is too difficult,can you show me _____,Wang Le? —Sure.
—What do you think of Ann? —Ann is so careful that she always goes over her exercises to ______ there are no mistakes.
—_____will your sister be back ? —In about two hours.
—Please don’t touch that fish.It smells _______. —OK,I won’t.
—People now can know what is happening in the world quickly. —You’re right.With the help of computers,news can ___every corner of the world.