--- Mr. Smith has been working all the morning without rest. --- He is a (n) man. He never looks tired.
Teenagers ______ social experience, so they are easily ______ when they first step into society.
Generally speaking, when _____ according to the directions, the medicine has no side effect.
The president spoke at the business meeting for nearly an hour without ______ his notes.
The printer has left two lines from this paragraph.
The officer demanded that such things ______from happening again.