Help! very simple problem...

Help! very simple problem...?
Match each quantity with the appropriate symbol for its unit, in the SI system. (If the first quantity corresponds to B, and the next 4 to C, enter BCCCC).

1) speed
2) time
3) acceleration
4) length
5) velocity

A. kg
B.m^2
C. m/s
D. s
E. m/s^2
F. m

not getting the diff between velocity and speed..

1 is C
2 is D
3 is E
4 is F
5 is C

note that F and B are not used in the answers.

Velocity is speed with a direction defined.
V = vector
S = scalar