1. Wouldn’t it be _____ wonderful world if all nations lived in ____ peace with one another?

A. a; /                   B. the; /                          C. a; the                  D. the; the  

2. Sam used to go and visit his mother _______ days.

 A. every a few      B. every other       C. every few       D. every third

3. ---- Has your father gone on business?

---- No. He ________ have but something prevented him at the last minute.

A. could      B. might      C. can       D. must