This kind of tiger has nearly died________,so we must take some measures to save them.
America is a country ________many different nationalities as well as one with foreign immigrants _______ the majority of its population.
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.