Question

He ate what he could, and gave the _____ of the food to the birds.

A．remain

B．uneaten

C．rest

D．part

Answer 1

　　C

　　the rest (of)剩余部分，其余。remain作“剩余物”(="what" is left)解时常用复数形式，如：the remains of a meal(残羹剩饭)。[ALI]《新英汉辞典》认为也可以用单数，可作参考。