8、(八) 根据材料回答问题材料一:子夏问孝。子曰:“色难。有事，弟子服其劳;有酒食，先生馔，曾是以为孝乎?” 材料二:子游问孝。于曰:“今之孝者，是谓能养。至于犬马，皆能有养;不敬，何以别乎?”材料三:有子曰:“其为人也孝弟，而好犯上者，鲜矣;不好犯上，而好作乱者，未之有也。君子务本，本立而道生。孝弟也者，其为仁之本与!”3.孔子在“孝道”方面有何主张?结合三则材料，谈谈你的理解。

21.I give( )my phone number.

20.Light travels( ) than sound.

19.I have never been good at singing，( ) I like to listen to it.

18.He is( ) than his brother.

17.This is the factory( ) we worked last year.

16.Do you know the girl( ) studies at Beijing University.

15.I don’t know( ) the banks are open?

14.The professor( ) the question to the students already.

13.I( ) to repair the car while you were watching TV.

12. Are you free( ) Saturday morning?