The Olympics used to be only for athletes, but recently they have been allowing professional athletes to participate.

Amateur

Explanation:

The word that is missing in this passage is amateur. Amateur athletes are those who participate in sports without any kind of remuneration (payment). This is the opposite to professional participants, who are paid for their performance, usually in both competition and training. In general, professional players are able to achieve a higher level of performance, as they are able to dedicate themselves exclusively to these pursuits.

- "a.) it includes letters and books gathered over 1200 years, and consists of two parts.

- most of the new testament is letters from paul to the different churches, and since there's a new testament that means there is an old testament. "