Your answer would be the following: for/among. That is, the first sentence would be as follows: after his cousins arrived, brianna waited for them with food. The second would be as follows: The beads were distributed among the 5,000 fans of "squeaky" johnson.
Explanation:
The first choice is the preposition <em>for</em> because it is a fixed collocation. The verb <em>to wait</em> always goes with the preposition <em>for. </em>Then, in the second sentence, the right choice is <em>among. </em>The more accurate difference between <em>among </em>and <em>between</em> is that between is used when naming distinct individual items and <em>among </em>when the items are part of a group or not specifically named. <em>Between </em>is also used to refer to 2 or 3 items, whereas <em>among </em>is used to talk about 3 or more. That is why <em>among </em>is the right choice here.