In each of the following questions a letter series is given, in which some letters are missing. The missing letters are given in the proper sequence as one of the alternative. Find the correct alternative.
1. a ____ aba ____ba____ab
1) abbba
2) abbab
3) babb
4) bbaba
5) aaabb
2. ab____b____bbaa
1) abaab
2) abbab
3) baaab
4) babba
5) ababa
3. ____baa____aab____ a____a
1) aabb
2) aaba
3) abab
4) baab
5) aaab
4. ____babbba____a____
1) ababb
2) baaab
3) bbaba
4) babbb
5) abbbb
5. ____op____mo____n____pnmop____
1) mnpmon
2) mpnmop
3) mnompn
4) mnpomn
5) mnmnpo