根据句意及首字母提示在横线处填上恰当的单词，使句子意思完整，语法正确。

1.  China has become a m________of the WTO.  It will play a more important role in the world.    

2.  If you want to drive a car, first you must get a driving l________.    

3.  We are not a_______to speak Ioudly when we are in the school library.    

4.  At p________,he is not here.  He has gone abroad on business.    

5．Our parents e_______many real hardships（艰苦生活）and they think our life now is much better than before.    

6.  Many young people v_______to teach the poor children in the local area.    

7.  I can't c________on my work when I am hungry.    

8.  How are you getting along with your s________in your school?    

9.  If you have an o________to go abroad, take it please.    

10. Can you d________a house for me? I think it must be nice.

关于“热机”，下列说法中错误的是：             [ ]

A ．通过技术改进，可以使热机的效率达到100%  

B ．减少城市热岛效应的措施之一就是倡导“绿色出行”。

C ．用水而不用其它循环物质降低热机的温度，主要是利用水的比热容最大的特性

D．严寒的冬天，有人晚上把热机水箱中的水放出，是防止气温降低时，水凝固而胀坏水箱