The man is David Johnson. Johnson is his ____ name and David is his ______ name.

A．family, first

B．first, family

C．first, last

D．family, last

This kind of plants are __________.Some day they will __________ forever.[ ]

A．dying off；die out  

B．dying away；die off

C．dying down；die out  

D．dying out；die away