Form the correct words out of their roots given in the brackets:

1. ............... (PREVENT) measures should be taken to provide maximum security to the heads of state arriving for the summit meeting on Sunday.
2. The deficiency of vitamins during the pregnancy period may lead to serious ............... (FORM) of the infant's body.
3. The specialists have been busy working out the new technologies of water .......... (PURE) which will be more efficient and less time consuming.
4. Dozens of automobiles have been ............ (MOBILE) en route to Salisbury because of the heavy snow storm.
5. Many years had gone by until the Africans captured by the English colonizers managed to break free from ............... (SERVE) to their masters.
6. The strict principles of the free market have brought about a complete ............ (COMMERCE) of life even in the most conservative societies.
7. I understand you don't like aunt Pamela, but you shouldn't be so .......... (DIFFER) to her polite questions.
8. Irregular meals can surely lead to chronic ............ (DIGEST) or even stomach ulcers in consequence.
9. The has been a long-standing ........ (RIVAL) between Mr Gore and his brother-in-law about superiority in the family business.
10. The spokesman's answers were more than .......... (EVADE) . He didn't even explain the cause of the dissolution of the government.
11. The officers preferred to keep the infuriated man in ............. (DETAIN) until he calmed down.
12. Aren't you going to attend the conference? What if some ......... (MOMENT) decisions are taken without your contribution?