17. You (save) ………. 40 watt-hours a day if you turn off your computer before bedtime.
A. saves B. saved C. would save D. will save
18. When I came to the stadium, the match (start) ……….
A. start B. started C. has started D. had started
19. If I (live) ………. out of town, I would take up the garden.
A. lived B. lives C. will live D. would love
ai giúp e vs ạ e cảm ơn
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