1. The auroras are caused by the .. of solar winds with gases in the Earths atmosphere.
2. As the new field-worker will be working in close _______________ with several others, make sure you select someone with an agreeable personality.
3. The ____ concerning total disarmament have broken down without leading any fruitful results.
4. The special committee has been called to discuss in detail the ____ in higher education.
5. When births outnumber deaths, the population increases; when the ____ is true, then it falls.
6. Among the problems facing bridge engineers, the most serious ones are those of ____ and repair.
7. The ____ was not a happy one at the time, but looking back on it I suppose Im glad it occurred.
8. Locke, Hobbes and Rousseau were concerned in their writings with the question of a proper ____ between the public good and the right of individuals to exercise free will.
9. As a result of continuing economic recession, a huge _____ in the budget seems inevitable.
10. I wasnt at all impressed by the ____ he gave me.