12. He prepared for his exam very carefully. Otherwise, he (not, pass) ______________that important exam.
13. He finished his home assignment. If not, the teacher (be) __________very angry.
14. Were he to remember her birthday, she (not, say) _____________goodbye to him.
15. Should you work hard, you (not, succeed) __________.
16. I have to inform him the news. If not, he (be) _________very bad-tempered.
17. John would have been staying with us this month if he (not, have) ________a bad quarrel with my younger brother.
18. Had she returned home from her business trip, she (visit) _________me tomorrow.
19. The temple would be in better condition now on condition that it (rebuild) __________for many years ago.
20. If my father went to Manchester last week, he (visit) ___________Real next week.