1.She had a house___,but she dared not live in it___.
A.on her own;by herself B.of her own;alone
C.of herself;on her own D.by herself;of own
2.Because of__mail we receive,we may not be able to reply to your letter.Please remember to include your full name with your letter.
A.a large many of B.a large number of
C.the large amount of D.a great reply of
3.-Who are you waiting for?
-The doctor__.
A.to operate on the patient B.who is being operated on C.to have an operation
D.who is having an operation.


感谢您的帮助！

1.B
of one's own 属于某人的 by oneslf =alone =on one's own“独自，单独”
2.C mail 不可数排除A \B，这里是由于所收到的信件数量太多the amount of “ ...的量”
3.A 不定式短语作后置定语修饰doctor，即将给病人动手术的医生
而不是医生本人接受手术，所以排除其它几个答案。