按要求写出相应的内容。   

1．写出两句珍惜时间的格言。   

     (1)                                                                                                                        

     (2)                                                                                                                        

2．写出两句表明要亲身实践的谚语。     

     (1)                                                                                                                          

     (2)                                                                                                                        

3．写出两句写景的诗句。     

     (1)                                                                                                                          

     (2)                                                                                                                        

承揽合同的概念和特征