I'm afraid I'm not ________ to help with the show next weekend.

Water can absorb and give off a lot of heat without big changes in temperature, thus creating a  _____
environment. 

The problem is how ____ the drug abuse remains in America.

Smoking and alcoholic drinking are an______ taste and are not in born.  

Fitness is important in sports but of at least _____ importance are skills.      

I should consider myself failing my duty  if I didn't take  ____  action at that moment.    

Lizzie was ______ to see her friend off at the airport

Because the driver was not ________ the new limit, he was stopped and warned for speeding.

The law of over－learning explains why cramming (突击学习) for an examination, though it may result in a passing grade, is not a ________ way to learn a school course.

The headmaster decided to have a word with whoever is ________ this matter.