---Do you have        trouble finishing the work?

---The work is not so difficult as you think．We have finished it already．

A．much

B．any

C．some

D．no

--- Jim took        one-hour ride just now. What a short time he spent finishing such a  long way!

--- He is _____      experienced rider.

A．an; the

B．an; a

C．a ;an

D．a; the