The reading passage required to find the contextual meanings of the words is not provided. Therefore, I will give general definitions for each word.

The reading passage required to find the contextual meanings of the words is not provided. Therefore, I will give general definitions for each word.

1. estimate: To form an approximate judgment or calculation of the value, number, quantity, or extent of something.
2. optimistic: Hopeful and confident about the future.
3. curbed: Restrained or kept in check.
4. spark: To ignite or trigger something; to cause something to happen or develop.
5. suffice: To be enough or adequate.
6. avert: To turn away (one's eyes or thoughts); to prevent (an undesirable occurrence) from happening.
7. susceptible: Likely or liable to be influenced or harmed by a particular thing.