The reason___________he gave for not coming to your birthday party is ___________his mother was ill.
Maybe you have been to many countries, but nowhere else __________ such a beautiful place.
I failed in the final examination last term and only then __________ the importance of study.
Only when your identity has been checked __________.
The old couple have been married for 40 years and never once __________ with each other.
Only after my friend came __________.