单项选择题
Conversation 2
A．The telephone is out of order. B．The line is busy. C．He is at a meeting. D．He won’t be back until next Monday.
A．Breakfast. B．Dinner. C．A 5-dollar gift card. D．Bus service to the airport.
A．A testing system. B．A monitor system. C．A measuring system. D．A control system.