1. The laws concerning the breeding of animals for research could turn out to be to the ---- of medical research.

2. At present, interest rates are comparatively ---- let‘s hope they remain that way.

3. In some parts of Western Europe, ---- in France, Denmark and Sweden, cohabitation has become almost as common as marriage.

4. What are some of the things that differentially affect siblings and help ---- their success or failure?

5. A strong ---- exists between a country‘s wealth and the freedom afforded its citizens.