1 . Climatic change could make the environment not ______ (habitat) for the polar bear to survive. （所给词的适当形式填空）

2 . The characticristies of first-degree burns is mildly ______ (swell). （所给词的适当形式填空）

3 . I believe that life in the countryside is more __________ (benefit) for children. （所给词的适当形式填空）

4 . Everyone will go through __________ (vary) difficulties in different periods. （所给词的适当形式填空）

5 . We can learn from Geogre’s success that it is _________(reward)to try new things. (所给词的适当形式填空)

6 . If you don't know much about cars, take a __________ friend along. (knowledge) (所给词的适当形式填空)

7 . The only __________ that I should be __________ about is that I never had the courage to try. (embarrass) (所给词的适当形式填空)

8 . We believe that students of ________ (integrate) schools will have more tolerant attitudes. (所给词的适当形式填空)

9 . Now that you have reached the age of 18, you should be____________(independence) of your parents. （所给词的适当形式填空）

10 . In August 1939,   a group of ______ (fright) children were boarding a train at Prague’s Wilson Station. (所给词的适当形式填空)