20. ________ your next high-adventure trip is scheduled, start preparing now.
A. In case B. Unless C. Only if D. Whenever
19. Your ideas are very interesting, but we need suggestions to get us out of the mess.
A. impressive B. similar C. practical D. traditional
18. Donald doesn’t have much patience - he often loses his _______.
A. courage B. mind C. balance D. temper
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