单词拼写

1．Though he is not a              (本国的) English speaker, he can speak English very fluently.

2．I don't think it's fair to accuse me of having an               (态度) problem.

3．Computer hackers have broken down security               (系统)，raising questions about the safety of information.

4．She used her family's history as a              (根据)for her novel.

5．The written word is a               (符号) for recording human speech.

6．People change their mind for a             (多样化) of reasons.

7．We are losing the game with our two               (主要的) players injured.

8．The companies are working together to create what they hope will be the best              (方式) of transport in the 21st century.

9．This is the              (典型的) question most of us hear during an interview.

10．Physical activity is an important              (因素) in keeping fit.

11．A great actor can bring a              (角色) to life.

12．In my opinion, what he told us just now about the               (事件) simply doesn't make any sense.

13．He highly               (感谢) our help after finishing the work together.

14．We know that these were              (具体的) instructions.

15．               (尽管)the efforts of the United Nations, the problem of drug  continues to grow.