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Put the verbs in brackets in the appropriate verb form.
In 1870 Mark Twain (to walk) along the streets of Boston when he (to
notice) in a shop window a machine he (not to see) before. He (to enter) the
shop, (to ask) the shop-assistant how the "monster" (to function) and (to buy)
it for 125 dollars. He (to bring) home the machine he (to nickname) 'the
monster' and (to start) practising on it at once. The machine (to be) a
typewriter and Mark Twain (to type) a whole book on it. When he (to bring)
his 'manuscript' to the editor, the latter (to be delighted). He (to make) Mark
Twain promise him to bring everything he (to write) later on typed on this
wonderful machine.
*Tom Sawyer" (to be) the first book Mark Twain (to typewrite).