(It is) (extremely) important (for) an engineer (to know) to use a computer.

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.