Why do you laughing all the time?
____ students should be given more free time is suggested by many experts and welcomed by kids in school.
When I try to find ______that prevent so many people from taking part in the program, it seems to me that there are two main causes.
— 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.
____is certain is ___prevention is more important than treatment .
Of one thing I am certain _____ hard work contributes to good results.