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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hsk4:mixed-revision:1
Join the facts: 他很忙。他每天练习汉语。Use 虽然……但是…… and preserve the concession.
Answer and reasoning · Respuesta y razonamiento
虽然他很忙，但是他每天练习汉语。忙 would suggest less practice, but the second fact contrasts with that expectation.
hsk4:mixed-revision:2
Complete and explain: 我听____了，可是还没记____。Use 懂 and 住.
Answer and reasoning · Respuesta y razonamiento
我听懂了，可是还没记住。Understanding and retaining are different results.
hsk4:mixed-revision:3
Write a request asking someone to speak more slowly, then say you cannot hear clearly.
Answer and reasoning · Respuesta y razonamiento
请说慢一点儿，我听不清楚。Teacher checks manner/result distinctions rather than demanding a single exact string.