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This is the key to the vocabulary page in unit 1 (page 15) about prefixes:

ACT. 1A: multi-talented; semi-professional; sub-standard; unimpressive; superhuman; arch-rivals; overcautious; under-prepared; single-handedly; outplayed; misfired; irrelevant.

ACT.1C: Degree,size,quality: sub-,super-,arch-,over-,under-,out-
Numbers: multi-,semi-,single-,mono-
Opposite/negative: un-,mis-,ir-,in-,im-,de

ACT.2: 1)We completely misunderstood the instructions; 2) I was unaware that you were a vegetarian; 3) I'm semi-retired; 4)That's right. We were completely outnumbered; 5)I'm overweight; 6)Yes, I underestimated the numbers.