With all his attention ______ on his experiment, he has no time to spend with his family.
Only then _________the importance of my health.
When ________ why she could speak English so well, she just smiled and said nothing.
I want a picture of you. Would you give me ___________?
In the future more stress should be placed __________ the education of the young.
It is uncommon that she is a person ___________up late .