The responsibilities in handbook（）that managers have to be concerned with efficiency and effectiveness in the work process.

A.I’m sorry，but I have another appointment tomorrow.Thanks anyway.
B.No.I have nothing planned tomorrow.
C.Well，I’ll be most delighted to conme over.

A.It is nice of you to say so，but I’m busy tonight.
B.No，I already have plans.
C.I’m ill，so I shouldn’t go out.