1．It’s illegal to read other people’s letters without p        .

2．Last month Liu Xiang defeated all his c      and finally won the gold medal after one year of training．

3．With the increase of the population，we may suffer from a short age of n     resources.

4．Having lived in Hainan for many years，he could not t     the cold weather in the north.

5．Some damage has been caused to this cultural site unintentionally by people，while some has been caused d       ．

6．Blood is the        (媒介)in which oxygen is carried to all parts of the body．

7．That job is a good test of your competence because it is very           (具有挑战性的)．

8．The brave deeds of those three students have received public       (认可) and praise.

9．The newly built entertainment park      (占用)much space in the suburb．

10．The two brothers       (与……相像)each other, so it’s difficult to tell one from the other.