Вставьте в пропуски слова в нужной форме.

1. depend, dependence, interdependence, independence, independent;
2. necessary, necessities, necessarily, unnecessary, unnecessaries;
3. vary, various, variety;
4. secure, security;
5. relative, relatively;
6. profit, profitable, profitability, profitably, profitless, unprofitable;
7. maintain, maintenance;
8. communicate, communication;
9. possible, possibility, impossible, possibly.

6. the level of living does not greatly in industrialized countries, it is the same.

7. if costs are higher the business and the firm will go bankrupt.

8. it is important for national governments to tradefacilities such as roads, railways, sea ports, and airports in good condition