Tom is here and a friend of _____ is here, too.
A. his father
B. his father's
C. he's father
They are both good at English, but ____ of them is good at maths.
A. both
B. either
C. neither
A friend of ____ came to see ____ yesterday.
A. his, his
B. his, him
C. him, his
_____ has taken my pen by mistake. I can't find it.
A. Somebody
B. Everybody
C. Nobody