1. We are sparing no efforts to create ________ more peaceful and more advanced world, ______ place where everyone enjoy his life and freedom.

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

2. We have various summer camps for your holidays. You can choose _______based on your own interests.

 A. either                B. each                      C .one                        D. it

3. Some exercises appear to be __________ you have done, but on second thoughts, you’ll find that they’re different.

A. that                 B. ones                 C. the ones               D. it