Excuse me, I can't ________ you. Could you please slow down a bit?

A．look up to       B．keep up with        C． live up to    D. come up with

--Excuse me, I can't ________ you．

--Could you please slow down a bit?

1. A.
   look up to
2. B.
   keep up with
3. C.
   live up to
4. D.
   come up with