The most important ________ of his speech was that we should all work whole-heartedly for the people.

A．Not at all
B．Of course I would
C．Of Course not
D．Certainly

A．Of course, you can.
B．Certain, you may.
C．Surely, you can't.
D．No, please get out.

A．How are you
B．How do you do!
C．Fine, thank you.
D．Everything is fine.