Нужно"! 1.alexander bell was …………………..a) an engineer; b) teacher; c) doctor. 2. he worked at inventing …………………..a) radio-set; b) tape-recorder; c) telephone. 3. he worked at it …………………..a) alone; b) with his friend; c)with a group of scientists. 4. the first transcontinental telephone line was opened between ……………..a) new york and san francisco; b) paris and london; c) rome and berlin .5. during the experiment mr. watson heard …………………..a) bell very badly; b) bell very well; c)nothing.