Consumers should do ________ than simply complain about the poor quality of goods.

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.