单项选择题
A．The woman is waiting for a call B．The telephone line is busy now. C．Somebody is using the telephone. D．The man cannot use the telephone.
A． Training of new employees B．Development of new products. C．Investigation of new markets. D．Improvement of the company’s sales.
A．Call him back. B．Wait for his call. C．Send him an email. D．Visit him in person.