1.
Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

a_bbc_aab_cca_bbcc

2.
Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

_ bc _ ca _ aba _ c _ ca

3.
Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

_ ab _ b _ aba _ _ abab.

4.
Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

bca _ b _ aabc _ a _ caa

5.
Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

b _ac _ cc _ cb _ ab _ ac