_____ these experiments were successfully completed would we think of going into humans.
_____ and you will break the world record.
— Where did you live as a child?—— A village _____ by hills on three sides.
Nowhere else, as Tim said, _____ except to the small garden in the backyard after school.
Someday, we are sure to understand the most important things are _____ that can’t always be bought with money.
We’ve been told that there will be an interval, _____ people can go to the restroom or buy some snacks.