As you walk out of the door with a person, you should say “______.”

－ Do you know some butterflies taste with their feet?－ _______　I can’t believe it.

 —You did a good job. I’m proud of you.—________.

—Jack，could I use your bike？I need to go to the market this afternoon.—______！I won't use it.

 — The government requires that every primary school student do sports for at least one hour every day.— _____. It is high time that students took exercise in order to build a strong body.