Sally's adolescent classmates call her and the other 125 members of her advanced computer software group "nerds," meaning she is part of a

correct fill up is crowd

Explanation:

solution

there is a large number of member group is created of 125 members

Sally's is also part of that advanced computer software group in the crowd  

as crowd become when a large number of people gathered at any place or any group  

here sally and 125 other makers gathered so she becomes part of the crowd

so here correct fill up is crowd

gold discovery in california, and pioneer settlers were sometimes pulled west because they wanted to make a better living. others received letters from friends or family members who had moved west. these letters often told about a good life on the frontier. the biggest factor that pulled pioneers west was the opportunity to buy land.

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