文档介绍：1 2 3 4 5 6 7 8 9 10 ing d knock v. 敲打 at/on knock quiet 宁静的，安静的，内向的 adj. quietly 宁静地 adv. in a quiet/low voice possible adj. 可能的
invitation n. 邀请；邀请函 The girl accepted the invitation. invite sb. to do The prince invites the girl to dance with him. 他邀请我去他家。 He invited me to his home. have a joke with sb. 和……开玩笑 play a joke on sb. 取笑某人