— I think I'm ____ to go back to work.

— I'm afraid not. You must stay in bed for two more days.[ ]

A. good enough

B. old enough

C. well enough

D. enough old

Which of the following statements is true about his friend

A．Writing exhausts his friend.

B．His friend collects a lot of things to write.

C．His friend always has enough material to write on.

D．His friend is doing research to write a paper.