英语练习遇到难题，请给出详细的解析，谢谢

Question

6.for breakfast ，I usually have ___ and two pieces of bread.
a.a half of milk cup
b.half a cup of milk
c.a half milk cup
d.half a milk cup

7.ten___ were hurt ,but no___ were lost in the accident.
a.people;life b. .people;lives
c.peoples;life d. .peoples;lives

8.that is ___ useful book .i have read it.
a.the b.an c./ d.a

9.we are now short __ fresh water .something must be done to stop people ___ polluting it.
a.for ;to b.for;from c.of;to d.of;from

10.the boys felt sad as they lost ___ the girls in the talk show.
A.by b.in c.to d.on

11.the changjiang river is the third __ in the world.
a.long river b. long rivers c. longest river d. longest rivers

12.i feel a bit hungry .
Why don’t you have___ bread?
a.some b.any c.little d.many

13.long time no see ,marry. How are things going?
__ ,thanks.
a.too bad b.quite well c.not at all d.I am right

14.why is your foreign teacher,s Chinese so good ?
Because he __China for eight years.
a.has gone to b.has been to c.has come to d.has been in

15.i am sorry you can,t go in now.the room __ yet .
a.has’t been cleaned b.has’t cleaned c.isn’t been cleaned d.isn’t being cleaned

Answer 1

6. b milk 为不可数名词，一杯牛奶 a cup of milk ， 半杯 half a cup of （像半小时 half an hour)
7. b people本身就是复数，作民族讲时，后才加-s
8. d useful音标是以辅音开头的，所以用 a
9. d be short of 不足， 短缺 stop sb from doing sth 阻止某人做某事
10. c lose sth to sb/ lose sth by sth 输掉，输给，被打败
11. c the +序数词+形容词最高级
12. a bread 是不可数名词，some 既可以修饰可数名词 也可以修饰不可数名词，little 修饰不可数名词，表否定， many 修饰可数名词
13. b
14.d for eight years 表一段时间，排除a c 表短暂性的动词，再根据句意选 d
15.a 根据 yet 可知时态要用现在完成时，主语是 the room ，所以是被打扫，要用被动语态

Answer 2

A BDBDDBBBA