句子天地（给完整的句子加上标点符号，把不完整的句子补充完整）。 
1．全神贯注地在听老师讲课
                                                                                                                                                      
2．禹因此成为人们世世代代敬仰和爱戴的英雄
                                                                                                                                                      
3．全国著名的劳动模范
                                                                                                                                                      

【考点】补充句子,标点符号

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