You can only be sure of_________ you have at present; you cannot be sure of something _____ you might get in the future.
He tried to escape __________ because he broke the school rule, but failed.
__________ the guidance of his director, he finishedhis report ahead of time.
—When did he begin to __________ painting? —At the age of 12.
The design has to __________to all ages and socialgroups.
It is __________ that he knew nothing __________ it.