friends of shoes（s____) 猜单词

关于一个英语小问题.
我看见有人这样写,friends foreign,是不是应该是friends of foreign?还是我想的错的.

I met a few friends of mine, one of ____ is a singer. A．him B．them C．who D．whom

几个简单的英语选择题
1 some friends of _______ joined the political ***.
a. my father
b. my father’s
c. my fathers'
d. my fathers
满分：2.5 分
2. peter, my english teacher always _______ me to study hard.
a. occupied
b. challenged
c. encouraged
d. convinced
3. mr. smith raises many _______ on his farm.
a. deers
b. sheeps
c. oxes
d. chickens
4. if you meet a new word and you are not sure what it means, _______ it _______ in a dictionary.
a. look at
b. look for
c. look after
d. look up
5. all the _______ in the hospital will get a rise tomorrow.
a. women-doctors
b. woman doctors
c. women doctors
d. doctors of women
6. the _______ of doctors agree that smoking is extremely harmful to health.
a. major
b. majority
c. minor
d. minority
满分：2.5 分
7. millie has _______ e-dog and its name is hobo.
a. a
b. an
c. the
d. /
8. 他对陌生人不太友善.
a. he is not very friend to strangers.
b. he is not very friendless to strangers.
c. he is not very friendship to strangers.
d. he is not very friendly to strangers.
9. he is learning to playing _______ guitar.
a. a
b. an
c. the
d. /
10. — sam, this is my friend, jane. — _______
a. i’m sam.
b. how are you?
c. glad to meet you, jane.
d. very well, thank you.
满分：2.5 分
11. i'm _______ of the package that's been left in the corridor.
a. worried
b. sharp
c. aggressive
d. suspicious
12. after the accident it took a long time before she had the _______ to get back in a car again.
a. time
b. confidence
c. opportunity
d. ability
13. the police asked me to _______ exactly how it happened.
a. express
b. draw
c. describe
d. imagine
14. she volunteered to take care of _______ wounded and _______ dying.
a. the, /
b. the, the
c. /, the
d. /, /
满分：2.5 分
15. no country can afford to neglect _______.
a. an education
b. educations
c. education
d. the education
16. you’re required to _______ your name at the end of this form.
a. spell
b. sign
c. tell
d. mark
满分：2.5 分
17. old mr. carter was convinced that women doctors were _______ to men.
a. superior
b. inferior
c. superiority
d. inferiority
满分：2.5 分
18. mrs. lenny gave us _______ on how to learn english well.
a. some advices
b. many advices
c. some advice
d. an advice
19. my son is already showing an interest _______ music.
a. on
b. to
c. in
d. at
做得好再加分,谢谢

some friends of mine后面加单数还是复数?
还有,some of,a few of,a little of 之类的后面加单数还是复数?要怎么判断?
快啊.
感激不尽啊.