The past perfect refers to a time earlier than before now. It is used to make it clear that one event happened before another in the past. It does not matter which event is mentioned first - the tense makes it clear which one happened first.
Answer:
The drill goes on for three days. One day the workers seem excited and suddenly a whoosh of water shoots into the air. Nya is stunned to see that it is new water. Everyone cheers and a woman sings a song of celebration. Nya frowns, though; the water is very muddy.
Explanation:
Salva met a lot of workers there, including Michael from Ireland. Salva had always wanted to learn English but it wasn’t until Michael that he learned. Michael helped him learn to read and to play volleyball.
One day a rumor begins spreading through the camp, that about three thousand boys will get to go to America. The rumor is confirmed, and people can talk about nothing else. After a few months, a list is posted for people making it to the interview step. Most of the boys are younger than Salva.