When I finally (A16)... to university I sometimes wished I (A17)

When I finally (A16)... to university I sometimes wished I (A17) ... arts instead of sciences. Despite the fact that the future historians and sociologists claimed that they (A18) ... very hard, they always seemed to be going out while I was always busy studying.
But now many of them can't find a proper job, whereas I recently (A19) ... a place of a production manager at one big company.
) was admitting
2) was admitted
3) admitted
4) had admitted
A17.
1) was choosing
2) chose
3) had chosen
4) would choose
A18.
1) have worked
2) were working
3) had been worked
4) have been working
A19.
1) had been offered
2) was offering
3) have been offered
4) will be offered