—It is rather cold here. Shall we light a fire? —No, we ______because things are easy to catch fire.
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.