__________knowledge comes from practice is known to all.
______ more energy to my study instead of being addicted to Internet games, I would be sitting in a comfortable office now.
The water of the Miyun Reservoir is regularly ______ to ensure the security of Beijing people’s drinking water.
It wasn’t until he was diagnosed with cancer ______ he realized the significance of health.
The sign over there says that no person ______ enter the area without official permission.
Ten years ago the population of our village was ______ that of theirs.