Only If Even IfSet 1

1Read the passage and fill in the blank with ONE suitable word: ..... only does this have a positive impact on employee retention, but it also makes the recruitment of great people significantly easier.
2If you are not a member, you cannot borrow books. (Begin: Only ..... )
3Probation is only granted .....
4She had just practiced for months. She finally mastered the piano piece.
5Part 4-Sentence Transformation (choose the correct version). If governments invest in education, real progress will follow.