Only when you ______ what you have learned to practice ______ say you have made it. 

He said that not until the wheat died from the lack of water_____ how serious the drought was.

---It’s reported that young people are responsible for 60% of the traffic accidents.---Exactly. Young drivers are far more _______ to drive faster than old ones.

At the foot of the mountain _______.

If you’ve finished, we can have a coffee.  ________, you’d better keep working.