一些名词的复数形式 急

一些名词的复数形式 急
tomato
potato
mango
zoo
half
scarf
stomach
ennmy
century
German
Japanese
American
Canadian
Australian
Chinese
deer
blind 的名词形式
everyone was generous and we had a lot of support from local _ (business)
unhappy的名词形式
medal的复数 wood有没有复数?
Yesterday I met a friend of _ _my father )in the street
Whose car is this It's _ (Mary and John)