Apply the course version boundaries in notes.md; HSK tasks are transferable language practice, not a claimed HSK 3.0 mock.
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hsk5:mixed-revision:1
Choose the relation: 一旦决定参加，____应该认真准备。Use 就 and explain the conditional link.
Answer and reasoning
一旦决定参加，就应该认真准备。Once the condition is met, the preparation obligation follows.
hsk5:mixed-revision:2
Write a connected short account using: 原来 / 后来 / 最后. Describe a missed bus and a successful alternative.
Answer and reasoning
Human review checks a coherent event sequence, appropriate connective use, an understandable alternative route and no contradiction between events.
hsk5:mixed-revision:3
Explain why 暂时关闭 does not establish that a shop has closed permanently.
Answer and reasoning
暂时 limits the closure to a temporary period; permanent closure adds unsupported duration.