15．The government had some laws 　　　　(change)after the meeting．

14．Mike can still remember 　　　　(give)a bike as a present on his 18th birthday．

13．The longer people waited for help，the 　　　　(danger)the situation became．

12．What you've said is 　　　　(possible)true．

11．There are too many new words in the 　　　　(twelve)unit．

10．Italy is an E　　　　 　country．

(C)根据句意，用所给单词的适当形式填空。

9．P　　　　 　future can be difficult．You never know what will happen in twenty years．

8．F 　　　　　has the fewest days of all the months．

7．Don't give up．You know hard work leads to s 　　　　．

6．It is a p　　　　 　letter，and you can't read it．