I don't like the question at all. I'd never refer to an egg as tender or half done.
When you're boiling an egg in its shell, the two alternatives are "hard boiled" and "soft boiled."
You can say "well done" if you're talking about a steak.
Though you didn't ask, let me add a couple more points about cooking eggs.
When you first take an egg out of its shell, then boil it, you have a "poached" egg.
When you fry an egg, the alternatives are "both sides" or "sunny side up."
When you stir an egg while you fry it, or before you fry it, you have a "scrambled" egg.
I'm afraid there are problems with tests and texts in China. Whenever possible, concentrate on materials written by native speakers. And continue to use this forum when you find something that doesn't make sense.
Student or Learner