单项选择题
A．She knows the guy who will give the lecture. B．She thinks the lecture might be informative. C．She wants to add something to her lecture. D．She’ll finish her report this weekend.
A．raise its efficiency B．cut unnecessary costs C．avoid seeming wasteful D．have fun in San Francisco
A．Teacher and student. B．Doctor and patient. C．Manager and office worker. D．Travel agent and customer.