Here are the correct forms of the words:

1. If we hadn't **economized** on food and water, we wouldn't have survived a single day in the cave.
2. The witness claimed she was capable of discovering the man's evil intentions from the **murderous** look in his eyes.
3. Jane's been granted a one-year **scholarship** at one of the most renowned universities in Europe.
4. Our father is a firm **believer** in faith healing. He even tries to propagate it among his friends.
5. “Have you got any **hope** it will be successful?”
6. It’s most **desirable** that all our employees should take a course in self-defense.
7. Mr. Cramp couldn’t find any **applications** for the welding machine in his workshop and, finally, he sold it to his brother-in-law.
8. Everybody was surprised at his **expected** explosion of anger. Before, he had said he was satisfied with the outcome of the negotiations.
9. Since she retired, she hasn't got much to do, and so she has taken up embroidering out of **boredom**.
10. The police forces which arrived after a short while were completely **powerless**. They couldn't stop the mob from fighting by any means.
11. We seven a rich **variety** of woolen sweaters in different colours and sizes.
12. It's expected that next month the government will receive a **definitive** answer to their request for financial support from the European Union.
13. This film may only be watched by children under parental **guidance**.
14. Mr. Parker’s proposal met with a sharp **refusal** from the other members of the Board.

For the insertions:

1. at
2. by
3. for
4. from
5. into
6. on
7. with

Let me know if you need further assistance!