With the development of the Internet, _______ communication is done by regular mail.
—Tom hadn’t worked hard and failed in the exam. But he said that was because the problems were too hard. —That is “.”
It was several minutes before I waswhat was happening.
John opened the door. Therehe had never seen before.
—Is Bob still teaching? —I’m afraid not. He is saidthe school as he has become a businessman.
—I wonder how much you charge(要价) for your services. —The first two are freethe third costs¥30.