Evidence obtained from observation and experiment is often used to _____ a scientific theory.

—Do you think_____ worthwhile to go all the way to Los Angles to buy that computer?—Well ,I’m going to visit some relatives, too. 

 I prefer _______ to __________ in my spare time.

My grandma still treats me like a child. She can’t imagine        grown up.

— Will you go to the annual meeting to be held in Sweden from the 26-30th of August 2008?— That depends on _______ I am invited.