Fiendishly difficult puzzles – how did you do?

In his celebration of the rich history of puzzles, Alex Bellos set readers some classic brainteasers. If you haven't finished with them then read no further, because the answers are below ...
See the puzzles here

TYPEWRITER. The question asked for a word that used only the 10 keys, not that uses every one of them. There are other answers, but those ones don't appear in the question.