Studies show that people are more_____ to suffer from back problems if they always sit before computer screens for long hours.

ard when young, ______ you will regret.

They demanded that the books ______ to the school library right away.

You were out when I went to your house thismorning.—Oh, I _______ for a friend from England at theairport.

unately, some natural signs which might have helped more people survive the earthquake were ________.