ANSWERS
A
PALATE, PALLID, ALPINE, ALPACA, LAPELS, LAPPED.
B
TENNIS, TENANT, NETTLE, NETHER, ENTIRE, ENTOMB
You cannot have NETBALL because it has more than six letters.
Holland is The Netherlands.
C
RACKET, RACIAL, CARBON, CAROLS, ARCTIC, ARCHER
D
TINSEL, TINNED, NITRIC, NITWIT, INTACT, INTERS