31.  The reason May be that: the present work doesn't suit to him, and he thinks the job cann't prove his abilitys .

32.  Similarly, if the job does not prove my ability, why should not I look for another job?

33.  I think it not only train my ability to adapt to the society but also proves my experence ability.

34.  The reasons, by contrast, are that the job isn't suitable for him, or he want to prove his ability, dispite the good conditions of the current job.

35.  Perhaps, to him, a new job can much more proves his capability, he likes changes around him .

36.  He wants to show his adaptability and prove his value in new conditions.

37.  They look the new challenges as tests to prove their bravey and capability, overcoming the difficuties they make themselves new .

38.  There are many facts to prove that he has done so.

39.  They want to prove that they have more abilities.

40.  The two changes proved that the government of those countries had been done many work to make a progress on the living condition in last 30 years.